Helvetia 820B
Mechanical
No photos yet
Notes
like 800, but plane base plate and different setting-lever spring
It's uncertain why this calibre got the designation 820B instead of 800B. Even samples with zwo crown-wheel screws are known, thus equivalent to the 800C.
Dimensions
| Width | 25.55 lignes (57.64 mm) |
|---|---|
| Height | 4.95 mm |
| Stem height | 1.2 mm |
| Hands (H × M × S) | 1.35 × 0.9 × 0.28 mm |
Technical data
| Beat rate | 18,000 vph (2.5 Hz) |
|---|---|
| Lift angle | — |
| Power reserve | 40 h |
| Jewels | — |
| Shock protection | — |
| Mobile stud carrier | No |
Complications
| Self winding | No |
|---|---|
| Date | No |
| Day | No |
| Hacking | No |
| Chronograph | No |
Mainspring
| GR code | GR4486 |
|---|---|
| Height | 1.6 mm |
| Thickness | 0.1 mm |
| Length | 300 mm |
| Barrel diameter | 9 mm |
Overview
| Type | Mechanical |
|---|---|
| Manufacturer | Helvetia |
| Year | — |
| Family | — |
| Clone of | — |
Related calibers
Documents
None
Updated 7 days ago · 0 revisions