IWC 77
Mechanical
c. 1917
No photos yet
Notes
1917-1921, 9400 (among them 600 with 23 jewels, 1000 with 21 jewels)
open face calibre
bimetallic screw balance with 4 adjustment screws
Breguet hairspring
for watchmakers eye: screwed jewel setting for 2nd wheel on dial side (Fig.4)
Dimensions
| Width | 37.4 lignes (84.37 mm) |
|---|---|
| Height | 4.3 mm |
| Stem height | 0.5 mm |
| Hands (H × M × S) | 1.55 × 0.9 × 0.2 mm |
Technical data
| Beat rate | 18,000 vph (2.5 Hz) |
|---|---|
| Lift angle | — |
| Power reserve | 44 h |
| Jewels | — |
| Shock protection | — |
| Mobile stud carrier | No |
Complications
| Self winding | No |
|---|---|
| Date | No |
| Day | No |
| Hacking | No |
| Chronograph | No |
Mainspring
| GR code | — |
|---|---|
| Height | 15 mm |
| Thickness | 0.2 mm |
| Length | — |
| Barrel diameter | 1.25 mm |
Overview
| Type | Mechanical |
|---|---|
| Manufacturer | IWC |
| Year | c. 1917 |
| Family | — |
| Clone of | — |
Documents
None
Updated 7 days ago · 0 revisions