Longines 291
Mechanical
Self-winding (rotor)
Date
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Notes
selfwinding gear from beryllium bronze
springless pawl wheels with hook-levers
With two levers and 15 teeth the pawl wheels are as efficient as a ratchet wheel wit 60 teeth, but significantly more durable, due to big teeth and the missing pressure of a click spring.
Moreover the levers are adjustible to compensate a certain amount of wear.
Dimensions
| Width | 26 lignes (58.65 mm) |
|---|---|
| Height | 5.9 mm |
| Stem height | — |
| Hands (H × M × S) | 1.6 × 1 × 0.2 mm |
Technical data
| Beat rate | 19,800 vph (2.75 Hz) |
|---|---|
| Lift angle | — |
| Power reserve | 45 h |
| Jewels | — |
| Shock protection | — |
| Mobile stud carrier | No |
Complications
| Self winding | Rotor |
|---|---|
| Date | Yes |
| Day | No |
| Hacking | No |
| Chronograph | No |
Mainspring
| GR code | GR2964-X |
|---|---|
| Height | 1.2 mm |
| Thickness | 0.12 mm |
| Length | 360 mm |
| Barrel diameter | 11 mm |
Overview
| Type | Mechanical |
|---|---|
| Manufacturer | Longines |
| Year | — |
| Family | — |
| Clone of | — |
Related calibers
Documents
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Updated 7 days ago · 0 revisions