Junghans J8
Mechanical
c. 1907
No photos yet
Notes
1907-1910
open face calibre
monometallic screw balance with press-fit staff
Breguet hairspring
brass lever and escape wheel
first pocket watch calibre designed by Junghans
The balance with press-fit staff and with riveted staff (of the later J13...J17) are completely with hairspring interchangable.
Dimensions
| Width | 41.4 lignes (93.39 mm) |
|---|---|
| Height | 5 mm |
| Stem height | 0.6 mm |
| Hands (H × M × S) | 1.82 × 1.15 × 0.21 mm |
Technical data
| Beat rate | 18,000 vph (2.5 Hz) |
|---|---|
| Lift angle | — |
| Power reserve | 35 h |
| Jewels | — |
| Shock protection | — |
| Mobile stud carrier | No |
Complications
| Self winding | No |
|---|---|
| Date | No |
| Day | No |
| Hacking | No |
| Chronograph | No |
Mainspring
| GR code | Zf3495 |
|---|---|
| Height | 16 mm |
| Thickness | 0.2 mm |
| Length | 460 mm |
| Barrel diameter | 2 mm |
Overview
| Type | Mechanical |
|---|---|
| Manufacturer | Junghans |
| Year | c. 1907 |
| Family | — |
| Clone of | — |
Documents
None
Updated 7 days ago · 0 revisions