Technical sheet
The Unitas pocket-watch calibre: big, hand-wound, small seconds at 9.
Features
Going train
| Arbor | Wheel | Pinion | True speed |
|---|---|---|---|
| Mainspring barrel | 96 | — | 1 rev / 8 hours |
| Center wheel | 80 | 12 | 1 rev / hour |
| Third wheel | 75 | 10 | 8 rev / hour |
| Fourth (seconds) wheel | 80 | 10 | 1 rev / minute |
| Escape wheel | 15 | 8 | 10 rev / minute |
Disclaimer
An approximation of the 6497 layout, not a manufacturer-accurate replica. Frequency (18,000 vph), 17 jewels, 46 h power reserve, Ø 36.6 mm (16½ lignes) and 4.5 mm height are published figures. Tooth counts and the exact shapes of bridges and parts are an approximation drawn from public photographs; the tooth counts are chosen so the fourth wheel turns once a minute, as the small seconds requires. The escapement motion is a kinematic model, not a physics simulation.