Junghans 683.71 (J83)
Mechanical
c. 1957
Self-winding (rotor)
Hacking
No photos yet
Notes
1957-1962
chronometer
only early samples with 28 jewels
The winding gear is integrated in the movement, instead of attaching it to a manual-wind calibre as usual. Despite the fairly high (for serial chronometers designed) base movement, this gave a back then acceptable heigth.
detached manual wind
unique: Instead of a friction spring, a magnet in a bushing cares for smooth motion of the indirect sweep second (Fig.3). The end of the sweep-second arbor runs on the polished surface of the magnet.
Dimensions
| Width | 28 lignes (63.16 mm) |
|---|---|
| Height | 5.7 mm |
| Stem height | 1.75 mm |
| Hands (H × M × S) | 1.4 × 0.8 × 0.18 mm |
Technical data
| Beat rate | 19,800 vph (2.75 Hz) |
|---|---|
| Lift angle | — |
| Power reserve | 33 h |
| Jewels | — |
| Shock protection | — |
| Mobile stud carrier | No |
Complications
| Self winding | Rotor |
|---|---|
| Date | No |
| Day | No |
| Hacking | Yes |
| Chronograph | No |
Mainspring
| GR code | — |
|---|---|
| Height | 10 mm |
| Thickness | 0.12 mm |
| Length | — |
| Barrel diameter | 1.15 mm |
Overview
| Type | Mechanical |
|---|---|
| Manufacturer | Junghans |
| Year | c. 1957 |
| Family | — |
| Clone of | — |
Documents
None
Updated 7 days ago · 0 revisions