Where do I find the Omega case reference?

Inside the caseback, engraved as two groups of digits such as 166.0020 or 145.0022. Older cases use a four-digit number with a suffix like 2577-1. It is not the movement serial number.

Should I measure the crystal before ordering?

Yes, always. The lookup gives you what Omega fitted at the factory. Cases get replaced crystals, bezels and gaskets over sixty years, and a generic crystal that has been in the watch for decades may not match the factory size. Measure the old crystal across its widest point and the case opening with a caliper, and compare with the size shown before you buy.

Omega crystal lookup

Q: What do PX, PZ and PY mean on an Omega crystal?

They are the same acrylic crystal with a different tension ring: PZ has a steel ring for steel cases, PX a yellow (2N) ring for yellow gold, gold-capped and gold-plated cases, PY a pink (5N) ring for pink gold. PW is a black ring. The four-digit number that follows is the size, so PX 5072, PY 5072 and PZ 5072 are all 31.60 mm across and 5.12 mm high.

Q: Where does this crystal data come from?

From Omega's own spare-parts bills of materials for each case reference, printed from the Omega customer-service system in 2011-2012, before Omega stopped supplying independent watchmakers in 2015. Watch Breaker holds these as part of its Omega reference database.

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Type the case reference from inside the caseback. You get the crystal Omega fitted at the factory — part number, material, tension-ring colour, diameter and height — and every other case that takes the same one. Or go the other way: type a crystal number, or a measured diameter.

Case reference, crystal number, or diameter in mm

Case references look like 166.0020 or 145.022. Crystal numbers look like PZ 5005 or 063PZ5005. A bare number with a decimal point is read as a diameter.

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Before you buy: measure. This lookup tells you what Omega fitted when the watch was new. Sixty years later the watch may carry a service crystal, a swapped bezel or a different gasket, and a generic crystal that has sat in the case for decades is not proof of the factory size. Put a caliper across the old crystal at its widest point (on a ringed crystal, across the tension ring) and across the case opening, and check both against the size shown. We get this right most of the time; a caliper makes it every time. If the sheet and your watch disagree, tell us — a correction with a measurement attached goes into the database.

158case references covered so far

139crystal part numbers

2012date of the Omega parts sheets behind it

Coverage is growing as the remaining Omega case sheets are loaded — about two thousand exist. If your reference isn't here yet, send the case reference and, if you can, the old crystal's measurements; it gets added.

How to read an Omega crystal number

Omega's modern part number for a crystal has three parts: a prefix, two letters and a four-digit size. 063 is a crystal supplied with its tension ring; 062 is a crystal without one. The letters say what it is made of and what colour the ring is:

Letters	Material	Ring	Fitted to
PZ	Plexi (acrylic)	steel ring	steel cases
PX	Plexi (acrylic)	yellow ring (2N)	yellow gold, gold-capped and gold-plated cases
PY	Plexi (acrylic)	pink ring (5N)	pink gold and pink-plated cases
PW	Plexi (acrylic)	black ring	Speedmaster chronographs
PN	Plexi (acrylic)	none	cases that take a plain pressed-in crystal
TN	Mineral glass	none	1970s and later
SN	Sapphire	none	late models and service upgrades

The four digits are the size, and only the size. PX 5072, PY 5072 and PZ 5072 are the same 31.60 mm × 5.12 mm crystal with a different-coloured ring. So if a seller lists a PX and your case is steel, you want the PZ of the same number — or, if the ring colour doesn't matter to you, the PX will physically fit. That single fact is the one most crystal listings get wrong.

Older collector guides refer to these same crystals by the letters and number alone ("a PZ 5005"), and the aftermarket makers (Sternkreuz and others) cross-reference to the Omega number. The number is what to search for.

Which crystals share a size

The same crystal serves many case references — a 31.62 mm steel-ring crystal (PZ 5005) fits a 286-calibre 135.0003, a 601-calibre 135.0011, a 613-calibre 136.0041 and a 565-calibre 166.0041. That is why a breaker keeps crystals by number, not by model. The full list held so far:

Crystal	Material / ring	Size	Case references
PN 0303 062PN0303	Plexi (acrylic) no ring	Ø 30.3 mm, height 3.2	132.5017
SN 0310 062SN0310	Sapphire no ring	28.5 × 25.5 mm, height 1	111.0133, 191.0046
SN 0357 062SN0357	Sapphire no ring	29.03 × 26.53 mm, height 1	162.0063
SN 0461 062SN0461	Sapphire no ring	26 × 21 mm, height 1.2	111.0136
SN 0525 062SN0525	Sapphire no ring	Ø 28.5 mm, height 1	196.0158
SN 0531 062SN0531	Sapphire no ring	Ø 28.5 mm, height 0.8	191.0077, 191.7361
SN 0535 062SN0535	Sapphire no ring	Ø 27.5 mm, height 0.8	145.0808
SH 0571002 062SH0571002	Sapphire metallised	Ø 33.5 mm, height 0.8	168.0068
SZ 0571002 062SZ0571002	Sapphire transferred marking	Ø 33.5 mm, height 0.8	168.0068
SN 0573 062SN0573	Sapphire no ring	Ø 21.5 mm, height 0.7	168.0068
SN 1012 062SN1012	Sapphire no ring	25.5 × 25.5 mm, height 0.7	195.3378
PN 1024 062PN1024	Plexi (acrylic) no ring	Ø 42.5 mm, height 3.3	121.1740
PN 1039 062PN1039	Plexi (acrylic) no ring	Ø 28.85 mm, height 3.4	196.0076
PN 1048 062PN1048	Plexi (acrylic) no ring	Ø 31.1 mm, height 2.9	131.0019
PN 1063 062PN1063	Plexi (acrylic) no ring	Ø 29.95 mm, height 3.7	121.0001
PN 1112 062PN1112	Plexi (acrylic) no ring	Ø 30.35 mm, height 3.8	132.0041
PN 2013 062PN2013	Plexi (acrylic) no ring	24 × 24 mm	111.0024
SN 2065 062SN2065	Sapphire no ring	Ø 25 mm, height 2.2	168.1629
PN 2076 062PN2076	Plexi (acrylic) no ring	24 × 24 mm	161.0022
PN 2104 062PN2104	Plexi (acrylic) no ring	28 × 28 mm	131.0022, 131.0042
PN 2105 062PN2105	Plexi (acrylic) no ring	not stated on the sheet	166.0059, 168.0044, 168.0047, 168.0059
PN 2137 062PN2137	Plexi (acrylic) no ring	26 × 20 mm	151.0041
PN 2178 062PN2178	Plexi (acrylic) no ring	34.1 × 22 mm, height 4	156.0002
SN 3002 062SN3002	Sapphire no ring	Ø 31 mm, height 2.65	175.0044
SA 3004 062SA3004	Sapphire anti-reflective, one side	Ø 28.5 mm, height 2.8	166.0300
SA 3005 062SA3005	Sapphire anti-reflective, one side	Ø 28.5 mm, height 2.5	168.1501
SN 3005 062SN3005	Sapphire no ring	Ø 28.5 mm, height 2.5	168.1501
SA 3007 062SA3007	Sapphire anti-reflective, one side	Ø 26 mm, height 3.1	168.1502, 168.1506, 168.1602, 168.1622
SA 3008 062SA3008	Sapphire anti-reflective, one side	Ø 30.5 mm, height 3.32	168.1603, 168.1613, 168.1620, 168.1623, 168.1629, 168.1630, 168.1634, 168.1640, 178.0514, 178.0515, 178.0522, 178.0523
SA 3025 062SA3025	Sapphire anti-reflective, one side	Ø 30 mm, height 2.65	175.0083, 175.0084
SA 3029 062SA3029	Sapphire anti-reflective, one side	Ø 31 mm, height 3.25	186.1998
SA 3030 062SA3030	Sapphire anti-reflective, one side	Ø 31 mm, height 3.5	177.0320
SA 3050 062SA3050	Sapphire anti-reflective, one side	Ø 33 mm, height 2.8	168.1111
SA 3051 062SA3051	Sapphire anti-reflective, one side	Ø 30 mm	168.1112, 168.1115
SB 3063 062SB3063	Sapphire anti-reflective, both sides	Ø 32.5 mm, height 4.6	168.1649, 178.1650, 178.1652, 178.1653
SA 3075 062SA3075	Sapphire anti-reflective, one side	Ø 30.5 mm, height 2.65	178.0055
SB 3085 062SB3085	Sapphire anti-reflective, both sides	Ø 35 mm, height 2.95	168.1128
PX 5004 063PX5004	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 4.2	165.0041
PY 5004 063PY5004	Plexi (acrylic) pink (5N) tension ring	Ø 31.62 mm, height 4.2	165.0041
PZ 5004 063PZ5004	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 4.2	165.0041
PX 5005 063PX5005	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 4.6	135.0003, 135.3018
PY 5005 063PY5005	Plexi (acrylic) pink (5N) tension ring	Ø 31.62 mm, height 4.6	135.0003
PZ 5005 063PZ5005	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 4.6	135.0003, 135.0011, 136.0041, 166.0041
SL 5005 062SL5005	Sapphire anti-reflective one side, metallised	Ø 34.2 mm, height 4.65	178.0020, 178.0022
PX 5008 063PX5008	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 5.1	168.0004, 168.0010
PY 5008 063PY5008	Plexi (acrylic) pink (5N) tension ring	Ø 31.62 mm, height 5.1	168.0004
PZ 5008 063PZ5008	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 5.1	168.0004, 168.0010
PX 5009 063PX5009	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 5.2	168.0004
PX 5011 063PX5011	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 5.2	168.0011
PX 5014 063PX5014	Plexi (acrylic) yellow (2N) tension ring	Ø 30.62 mm, height 5	165.0003
PY 5014 063PY5014	Plexi (acrylic) pink (5N) tension ring	Ø 30.62 mm, height 5	165.0003
PZ 5014 063PZ5014	Plexi (acrylic) steel tension ring	Ø 30.62 mm, height 5	165.0003
PX 5025 063PX5025	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 3.6	165.0008
PY 5025 063PY5025	Plexi (acrylic) pink (5N) tension ring	Ø 31.62 mm, height 3.6	165.0008
PZ 5025 063PZ5025	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 3.6	165.0008
SA 5071 062SA5071	Sapphire anti-reflective, one side	Ø 25 mm, height 0.8	166.0300
PX 5072 063PX5072	Plexi (acrylic) yellow (2N) tension ring	Ø 31.6 mm, height 5.12	135.0020, 166.0020
PY 5072 063PY5072	Plexi (acrylic) pink (5N) tension ring	Ø 31.6 mm, height 5.12	135.0020, 166.0020
PZ 5072 063PZ5072	Plexi (acrylic) steel tension ring	Ø 31.6 mm, height 5.12	135.0020, 166.0020
PZ 5076 063PZ5076	Plexi (acrylic) steel tension ring	Ø 30.62 mm, height 5.5	165.0024, 166.0024, 166.0073
SN 5077 062SN5077	Sapphire no ring	Ø 28 mm, height 0.8	196.0189
PX 5082 063PX5082	Plexi (acrylic) yellow (2N) tension ring	Ø 30.94 mm, height 4.75	165.0023, 166.0022, 168.0015
PY 5082 063PY5082	Plexi (acrylic) pink (5N) tension ring	Ø 30.94 mm, height 4.75	165.0023, 166.0022, 168.0015
PZ 5082 063PZ5082	Plexi (acrylic) steel tension ring	Ø 30.94 mm, height 4.75	165.0023, 166.0022, 168.0015
PX 5083 063PX5083	Plexi (acrylic) yellow (2N) tension ring	Ø 32.94 mm, height 4.3	135.0033, 166.0039
PY 5083 063PY5083	Plexi (acrylic) pink (5N) tension ring	Ø 32.94 mm, height 4.3	166.0039
PZ 5083 063PZ5083	Plexi (acrylic) steel tension ring	Ø 32.94 mm, height 4.3	165.0039, 166.0039, 166.0175
PZ 5105 063PZ5105	Plexi (acrylic) steel tension ring	Ø 31.12 mm, height 5.35	135.0027
PX 5106 063PX5106	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 4.15	168.0022
PY 5106 063PY5106	Plexi (acrylic) pink (5N) tension ring	Ø 31.62 mm, height 4.15	168.0022
PZ 5106 063PZ5106	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 4.15	168.0022
PX 5111 063PX5111	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 5	166.0032, 168.0016
PY 5111 063PY5111	Plexi (acrylic) pink (5N) tension ring	Ø 31.62 mm, height 5	166.0032, 168.0016
PZ 5111 063PZ5111	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 5	166.0032, 168.0016
PX 5117 063PX5117	Plexi (acrylic) yellow (2N) tension ring	Ø 22.4 mm, height 4.4	566.0015
PX 5118 063PX5118	Plexi (acrylic) yellow (2N) tension ring	Ø 29.62 mm, height 5.33	168.0029
PY 5118 063PY5118	Plexi (acrylic) pink (5N) tension ring	Ø 29.62 mm, height 5.33	168.0029
PZ 5118 063PZ5118	Plexi (acrylic) steel tension ring	Ø 29.62 mm, height 5.33	168.0029
PX 5123 063PX5123	Plexi (acrylic) yellow (2N) tension ring	Ø 32.94 mm, height 4.9	136.0017, 166.0036, 166.0049, 166.0079
PY 5123 063PY5123	Plexi (acrylic) pink (5N) tension ring	Ø 32.94 mm, height 4.9	166.0036, 166.0079
PZ 5123 063PZ5123	Plexi (acrylic) steel tension ring	Ø 32.94 mm, height 4.9	136.0017, 166.0036, 166.0079
SN 5126 062SN5126	Sapphire no ring	Ø 27.5 mm, height 1	178.0020
PZ 5137 063PZ5137	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 4.4	146.0009
PW 5139 063PW5139	Plexi (acrylic) black tension ring	Ø 34.13 mm, height 5.1	105.0003, 145.0012, 145.0302, 145.0809
PX 5143 063PX5143	Plexi (acrylic) yellow (2N) tension ring	Ø 30.62 mm, height 5.4	166.0003
PY 5143 063PY5143	Plexi (acrylic) pink (5N) tension ring	Ø 30.62 mm, height 5.4	166.0003
PZ 5143 063PZ5143	Plexi (acrylic) steel tension ring	Ø 30.62 mm, height 5.4	166.0003
PZ 5144 063PZ5144	Plexi (acrylic) steel tension ring	Ø 32.12 mm, height 4.7	145.0017
TN 5146 063TN5146	Mineral glass no ring	Ø 36.5 mm, height 3	145.0026
PZ 5152 063PZ5152	Plexi (acrylic) steel tension ring	Ø 30.62 mm, height 6	166.0324
TN 5165 063TN5165	Mineral glass no ring	Ø 31 mm, height 3	166.0068
TN 5166 063TN5166	Mineral glass no ring	Ø 34.5 mm, height 3	166.0092
SN 5172 062SN5172	Sapphire no ring	Ø 25.5 mm, height 1.2	168.1111, 168.1112, 168.1115
TN 5177 063TN5177	Mineral glass no ring	not stated on the sheet	145.0023
PX 5178 063PX5178	Plexi (acrylic) yellow (2N) tension ring	Ø 35.12 mm, height 5	166.0072
PZ 5178 063PZ5178	Plexi (acrylic) steel tension ring	Ø 35.12 mm, height 5	166.0072
PZ 5181 063PZ5181	Plexi (acrylic) steel tension ring	Ø 33.12 mm, height 5	166.0071
PZ 5184 063PZ5184	Plexi (acrylic) steel tension ring	Ø 33.12 mm, height 4	145.0024
PX 5188 063PX5188	Plexi (acrylic) yellow (2N) tension ring	Ø 31.94 mm, height 4.3	166.0161
PZ 5188 063PZ5188	Plexi (acrylic) steel tension ring	Ø 31.94 mm, height 4.3	166.0161
TN 5190 063TN5190	Mineral glass no ring	Ø 31 mm, height 2	166.0130, 166.0244
TN 5194 063TN5194	Mineral glass no ring	Ø 32 mm, height 2.5	166.0087, 166.0090
TN 5195 063TN5195	Mineral glass no ring	Ø 31 mm, height 2.5	166.0137
PX 5200 063PX5200	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 3.7	166.0117, 166.0168
PZ 5200 063PZ5200	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 3.7	136.0102, 136.0103, 166.0117, 166.0168, 166.0214
PZ 5209 063PZ5209	Plexi (acrylic) steel tension ring	Ø 32.94 mm, height 3.9	166.0107
TN 5218 063TN5218	Mineral glass no ring	30 × 30 mm, height 2	166.0138
SN 5228 062SN5228	Sapphire no ring	Ø 28.5 mm, height 1.5	168.1128
SN 5229 062SN5229	Sapphire no ring	Ø 29 mm, height 1.5	157.0001, 166.0247, 168.0057, 168.0064, 191.0050
TN 5229 063TN5229	Mineral glass no ring	32 × 26 mm, height 1.7	196.0013
TN 5237 063TN5237	Mineral glass no ring	Ø 35 mm, height 2	176.0012
TN 5238 063TN5238	Mineral glass no ring	Ø 30 mm, height 2	196.0022
PX 5241 063PX5241	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 4.35	166.0169
PZ 5241 063PZ5241	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 4.35	166.0169
PX 5249 063PX5249	Plexi (acrylic) yellow (2N) tension ring	Ø 31.12 mm, height 3.8	196.0058
PZ 5249 063PZ5249	Plexi (acrylic) steel tension ring	Ø 31.12 mm, height 3.8	196.0058
TN 5256 063TN5256	Mineral glass no ring	Ø 30 mm, height 2.5	166.0177
PW 5274 063PW5274	Plexi (acrylic) black tension ring	Ø 31.12 mm, height 4.1	175.0040, 175.0041
PX 5274 063PX5274	Plexi (acrylic) yellow (2N) tension ring	Ø 31.12 mm, height 4.1	175.0032
TN 5274 063TN5274	Mineral glass no ring	Ø 31.12 mm, height 4.1	176.0016
PX 5284 063PX5284	Plexi (acrylic) yellow (2N) tension ring	Ø 31.62 mm, height 3.8	196.0071, 196.0106
PZ 5284 063PZ5284	Plexi (acrylic) steel tension ring	Ø 31.62 mm, height 3.8	196.0071, 196.0106
PZ 5291 063PZ5291	Plexi (acrylic) steel tension ring	Ø 30.62 mm, height 3.8	196.0083
TN 5300 063TN5300	Mineral glass no ring	27.5 × 25.5 mm, height 1.5	192.0036
TN 5307 063TN5307	Mineral glass no ring	Ø 30 mm, height 1.2	196.0128
SL 5308 062SL5308	Sapphire anti-reflective one side, metallised	Ø 30.7 mm, height 3.9	175.0042
TN 5308 063TN5308	Mineral glass no ring	27 × 27 mm, height 1.2	186.0009
TN 5310 063TN5310	Mineral glass no ring	29.5 × 29.5 mm, height 1.5	196.0115
SV 5314 062SV5314	Sapphire anti-reflective both sides, metallised	Ø 30 mm, height 4.9	168.1200
SN 5319 062SN5319	Sapphire no ring	Ø 32 mm, height 3.5	166.0077
TN 5325 063TN5325	Mineral glass no ring	Ø 28.5 mm, height 0.8	192750, 195.0039
TN 5328 063TN5328	Mineral glass no ring	Ø 27.5 mm, height 0.8	166.0263, 166.0265, 195.0011
TN 5332 063TN5332	Mineral glass no ring	27.5 × 26.5 mm, height 0.8	196.0167
TN 5337 063TN5337	Mineral glass no ring	26.5 × 26.5 mm, height 0.8	191.0102
TN 5338 063TN5338	Mineral glass no ring	27.5 × 27.5 mm, height 0.8	196.0169
PX 5342 063PX5342	Plexi (acrylic) yellow (2N) tension ring	Ø 31.12 mm, height 4.1	175.0034
TN 5347 063TN5347	Mineral glass no ring	26.5 × 26.5 mm, height 0.8	166.0266
TN 5388 063TN5388	Mineral glass no ring	27 × 20 mm, height 0.8	191.0172
TN 5446 063TN5446	Mineral glass no ring	Ø 24.5 mm, height 0.8	175.0032

Sizes are as printed on Omega's sheets: D is the diameter, H the overall height, both in millimetres. Rectangular crystals are given as width × height across the crystal. Where a sheet printed the number without a size, the size is left blank rather than guessed.

Questions people ask

What do PX, PZ and PY mean on an Omega crystal?

Same acrylic crystal, different tension ring: PZ steel, PX yellow (2N), PY pink (5N), PW black. The four-digit number is the size. PX 5072, PY 5072 and PZ 5072 are all 31.60 mm across and 5.12 mm high.

Where do I find the case reference?

Inside the caseback, as two groups of digits — 166.0020, 145.022 — or on older cases a four-digit number with a suffix, like 2577-1. It is not the movement serial number; that lives on the movement and dates the watch.

My case reference isn't listed.

Only part of Omega's case-sheet library is loaded so far. Email the reference and, if you can measure it, the old crystal's diameter and height; it gets added and you get the answer by reply.

Should I measure before ordering?

Yes. The lookup shows the factory fit. Old watches have been re-crystalled, re-bezelled and re-gasketed, and a crystal that has been in the case for thirty years is not evidence of the original size. A caliper across the old crystal and the case opening settles it.

Where does the data come from?

Omega's own spare-parts bills of materials for each case reference, printed from the Omega customer-service system in 2011–2012, before Omega stopped supplying independent watchmakers in 2015. Watch Breaker holds these as part of its Omega reference database, alongside the GF 620 movement catalogues that power the .

Which crystal fits my Omega?

Omega's own case sheet for the 168.0057 (a 1972 Constellation, calibre 1021) lists crystal 062SN5229: sapphire, 29 mm across, 1.5 mm high, the same number on the steel, two-tone and gold cases. For any other reference, type it into the free crystal lookup.

Watch Breaker is an independent identification specialist and parts dealer and is not affiliated with, endorsed by or connected to Omega SA or the Swatch Group. Omega is a trademark of Omega SA. Part numbers are quoted for identification; sizes should be confirmed by measurement before purchase. Terms.