Lookup · Case parts
Omega case parts lookup: crown, gasket and crystal by case reference
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Type the case reference from inside the caseback. You get the parts Omega listed for that case: the crown, the case-back gasket, the crystal and its ring, the calibre inside, and the bracelet where Omega named one. 1,403 case references from Omega's 1993 case parts catalogue, mostly watches from the 1970s and 1980s.
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Check before you buy. This is what Omega listed for the case, not proof of what is in your watch today. Crowns, crystals and gaskets get swapped at service. Compare the number on your old part, or put a caliper across the crystal, before you order. Spot a number that looks wrong? Tell us with a photo and it gets checked against the book.
Omega case parts on eBay
Live listings and real sold prices. For one exact part, use the eBay link beside its number in the lookup.
How to read an Omega case reference
A reference such as 166.0263 is a code. Omega printed the key in its 1993 catalogue: the first three digits say what kind of watch it is, the last four are the case number.
| Digit | Means | Examples |
|---|---|---|
| 1st | Type of watch | 1 gent's watch · 2 gent's jewellery watch · 3 gent's bracelet watch · 5 lady's watch · 7 lady's bracelet watch |
| 2nd | Movement | 1 manual, no seconds · 2 manual, small seconds · 3 manual, centre seconds · 4 manual chronograph · 5 automatic, no seconds · 6 automatic, centre seconds · 7 automatic chronograph · 8 electronic chronograph · 9 electronic |
| 3rd | Water resistance and extras | 1 not water-resistant · 2 calendar · 3 chronometer · 4 chronometer, calendar · 5 water-resistant · 6 water-resistant, calendar · 7 water-resistant chronometer · 8 water-resistant chronometer, calendar |
So 166 is a gent's automatic with centre seconds, water-resistant, with a calendar; 145 is a gent's manual chronograph, water-resistant. The letters in front, such as ST or MD, are the case metal.
The metal letters
Show the full table (11 rows)
| Letters | Case metal, as Omega's 1993 catalogue gives it |
|---|---|
| ST | Steel |
| MD | Plated 20 microns yellow, steel back |
| DL | Two-coloured, plated 20 microns yellow |
| DA | Steel and yellow gold 18 ct |
| DD | Steel and yellow gold 14 ct |
| DB | Steel and pink gold 18 ct |
| DR | Pink gold 18 ct bezel on steel |
| MF | Plated 20 microns white, steel back |
| BA | Yellow gold 18 ct |
| BC | White gold 18 ct |
| TI | Titanium |
The lookup spells out every metal code on the result, including the rare ones.
Crystal letters in the result
The crystal number carries two letters for the material: TN mineral glass, SN sapphire, PN plain acrylic, and PZ, PX, PY acrylic with a steel, yellow or pink tension ring. A 063 crystal comes with its ring, a 062 without. For sizes, and for older cases from Omega's 2012 case sheets, use the crystal lookup.
Questions people ask
Where do I find the Omega case reference?
Inside the caseback, engraved as two groups of digits such as 196.0237 or 166.0263, sometimes with metal letters in front (ST, MD, BA). It is not the movement serial number.
Why does one reference show more than one set of parts?
Omega made many cases in more than one metal. Steel, plated and gold versions of the same reference often take a different crystal ring or crown, so each metal is listed with its own parts where they differ.
What do the first three digits of an Omega reference mean?
In Omega's key, printed in its 1993 catalogue, the first digit is the type of watch (1 gent's watch, 5 lady's watch, 3 gent's bracelet watch), the second is the movement (6 self-winding centre second, 4 manual chronograph, 9 electronic) and the third is water resistance and calendar (5 water-resistant, 6 water-resistant calendar). So 166 is a gent's self-winding centre-second watch, water-resistant with a calendar.
Where does this data come from?
From Omega's printed case parts catalogue of 1993, which lists the crown, gaskets, crystal, crystal ring and other case parts for each case reference Omega still supported then, mostly cases from the 1970s and 1980s. Every page was read twice and compared number by number.
Should I check the part before I buy?
Yes. The lookup gives what Omega listed for the case. After forty years a watch may carry a service crown, a swapped crystal or an old gasket, so compare the number with your part, or measure the crystal, before you buy.
Part numbers are Omega's, typed by hand from Omega's 1993 case parts catalogue and read twice; no catalogue pages are reproduced. A few numbers that are hard to read on our copy are held back until checked against the book. Watch Breaker is not affiliated with Omega SA or the Swatch Group. Omega is a trademark of Omega SA. Terms.