Technical sheet
The Moonwatch calibre: hand-wound, cam-operated chronograph with a horizontal clutch.
Features
Going train
| Arbor | Wheel | Pinion | True speed |
|---|---|---|---|
| Mainspring barrel | 78 | — | 1 rev / 6.5 hours |
| Center wheel | 80 | 12 | 1 rev / hour |
| Third wheel | 75 | 10 | 8 rev / hour |
| Fourth (seconds) wheel | 72 | 10 | 1 rev / minute |
| Escape wheel | 15 | 6 | 12 rev / minute |
Disclaimer
An approximation of the Omega 1861 layout from public drawings and photographs, not a manufacturer-accurate replica. Manual winding, 21,600 vph (3 Hz), 48 h power reserve (Omega; WristBuzz gives about 45 h), 18 jewels, Ø 27.00 mm, 6.87 mm height, rhodium-plated finish, a cam-operated chronograph with horizontal clutch and Delrin brake, small seconds at 9, 30-minute recorder at 3 and 12-hour recorder at 6, and no hacking are published figures. Tooth counts, wheel sizes, the bridge outlines and the chronograph levers, cam, hammer and brake are an approximation (no exploded view or service document was found); the tooth counts make the fourth wheel turn once a minute and the escape wheel match 21,600 vph. Parts are drawn larger than life and the stack is taller than the real 6.87 mm. The escapement and chronograph motions are kinematic models.
Sources