A vintage Speedmaster with a 321 or an 861 is hand-wound: push the crown in, turn it forward until it stops, once a day. The automatic Speedmasters of the 1970s and the later Reduced wind themselves on the wrist and only need a few turns to start. Everything below comes from Omega's own records and technical guides.
Quick answers
- Is the Speedmaster automatic? The classic one is not. Of the 100 Speedmaster references in Omega's records, 49 are hand-wound and 39 automatic. The 321 and the 861 are hand-wound; the 1040, 1045 and the Reduced are automatic.
- How far do I wind it? A hand-wound Speedmaster: until the crown stiffens and stops. An automatic: a short wind to start it, then your wrist does the rest.
- How long does a full wind last? 44 to 50 hours on the calibres Omega's guides give figures for. The table below lists them.
- Can I overwind it? Not an automatic. A hand-wound one simply stops turning when it is full. Stop there.
Hand-wound or automatic? Find out first
Read the case reference inside the caseback and type it into our free reference lookup: Omega's own records give the calibre and whether it winds by hand or by rotor. The Speedmaster guide lists all 100 references by calibre.
The calibre designation settles it. Omega prints RA in the designation of a self-winding calibre. The 321 reads 27 CHRO C12 T2 PC AM 17p and the 861 family 27 CHRO C12 PC, with no RA: hand-wound. The 1040 reads 31 CHRO C12 RA PC CAL CORR: automatic. Our free calibre lookup shows the line for yours.
How to wind it
A hand-wound Speedmaster: 321, 861, 863, 1861, 1863
- Push the crown fully in.
- Turn it forward, toward 12 o'clock. Turning it back winds nothing.
- Stop when the crown stiffens and won't go further. A hand-wound mainspring has no slipping attachment, so that stop means the spring is full. Never force past it.
- Wind once a day, at about the same time. A full wind runs about two days on these calibres, so a daily wind leaves time to spare.
An automatic Speedmaster: 1040, 1045 and the Reduced
- If it has stopped, push the crown fully in and turn it forward to start it.
- Give it a short wind, set the time, and wear it. The rotor keeps it wound while you move.
- Don't worry about overwinding. An Omega automatic's mainspring sits on a slipping attachment; Technical Guide No. 1 (1954) says it must begin to slip only after at least five turns of winding. Past that point, extra turns slip harmlessly.
- Know the crown positions. Omega's 1972 guide for the calibre 1040 numbers them: 1 winding, 2 rapid date correction, 3 hand setting.
How long a full wind runs
Omega's guides give running times for the main Speedmaster calibres. Reference counts are from Omega's own records, with a reference listed for two calibres counted under both.
| Calibre | Winds | Speedmaster references | Full wind runs | Source |
|---|---|---|---|---|
| 321 | hand-wound | 6 | not printed in the guides we hold | GF 620-4 (no RA in its designation) |
| 861 | hand-wound | 16 | 50 h (1970 guide) or 45 h (2004 guide) | Omega technical guides, 1970 and 2004 |
| 863 | hand-wound | 5 | not printed in the 863 guide we hold | Omega technical guide, 2002 |
| 1863 | hand-wound | 5 | 45 h | Omega technical guide, 2002 |
| 1040 | automatic | 2 | 45 h | Omega technical guide, 1972 |
| 1045 | automatic | 6 | 45 h | Omega technical guide, 1976 |
| 1150, 1151, 1152 | automatic | 18 | 44 h | Omega technical guides |
Omega printed two figures for the 861: 50 hours in its 1970 guide for the 860, 861, 910 and 930, and 45 hours in its 2004 guide for the 861. Both are Omega's own; we keep both on record. A full wind that runs well short of its figure points to a tired mainspring or a movement due for service. Every calibre's mainspring has its own factory number, and the parts finder gives it.
Questions owners ask
Is the Omega Speedmaster automatic?
The classic vintage Speedmaster is not. Omega's records give the first Speedmasters the 321 and, from 1968, the 861, both hand-wound chronographs. Automatic Speedmasters exist too: the Mark III, IV and V and the 125 on the 1040, 1041 and 1045 from 1971, and the Reduced from 1988. Your case reference tells you which you have.
How do I know when a hand-wound Speedmaster is fully wound?
The crown stiffens and stops turning. That stop is the full mainspring. Never force past it.
How long does a Speedmaster run on a full wind?
Omega's 1970 guide for the 860, 861, 910 and 930 gives 50 hours. Its 2004 guide for the 861 and its 2002 guide for the 1863 give 45 hours. Both figures are Omega's own; the table on this page lists each calibre.
Can I overwind an automatic Speedmaster?
No. An Omega automatic's mainspring sits on a slipping attachment that lets go once the spring is full; Omega's Technical Guide No. 1 (1954) sets it to slip only after at least five turns.
Which calibre is in my Speedmaster?
Read the reference inside the caseback and type it into the free reference lookup. Omega's records give the calibre for each one. If you can't open it, or the movement doesn't match, the US$75 Movement ID Report checks it from photos.
Not sure what you have? Start with the free reference lookup, serial lookup and calibre lookup. For it in writing, checked against the catalogues, the Movement ID report is US$75, and nothing to pay until I confirm the photos can answer it.