Technical sheet
The 3 Hz automatic from SII: Magic Lever winding, hacking, hand-winding, date at 3.
Features
Going train
| Arbor | Wheel | Pinion | True speed |
|---|---|---|---|
| Mainspring barrel | 72 | — | 1 rev / 6 hours |
| Minute (1 rev/h) wheel | 64 | 12 | 1 rev / hour |
| Third wheel | 60 | 8 | 8 rev / hour |
| Seconds (fourth) wheel | 96 | 8 | 1 rev / minute |
| Escape wheel | 15 | 8 | 12 rev / minute |
Disclaimer
An approximation of the NH35 layout from public drawings and photographs, not a manufacturer-accurate replica. 21,600 vph (3 Hz), 24 jewels, a power reserve of more than 41 h, Ø 27.40 mm (12‴), 5.32 mm height, bidirectional automatic winding on a ball-bearing rotor, hand winding, hacking and the quick-set date are published figures (TMI specification sheet); the Magic Lever is named by Unimatic and Caliber Corner. Tooth counts, the seconds drive and the exact shapes and positions of parts are an approximation from the TMI drawings; the tooth counts make the seconds wheel turn once a minute and the escapement beat 21,600 times an hour. No source checked names the escapement type: the lever escapement shown is a generic illustration, and its motion is a kinematic model, not a physics simulation.
Sources