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Bettlach 8391-66
(EB)
Jewels: 7
Power Reserve: 34 hrs
Frequency: 18000 vph
Type: Manual Wind
Period used: 1903-1945
Diameter: 43.1 mm
Height: 6.65 mm
Hands: 1.65 x 0.92 / 0.25 mm
The Bettlach 8391-66 watch movement, produced between 1903 and 1945, is an open face calibre, model 7. It features a bimetallic screw balance and a Breguet hairspring. The movement incorporates a negative stem mechanism, allowing for switching between winding and setting through the stem in the lever position. Additionally, the escapement of the Bettlach 8391-66 has been modified compared to similar models such as the 210. The movement also includes functions such as stem wind, switching by crown or lever, and a sub second.
The Bettlach 8391-66 features the following functions:
- Stem wind, with switching by crown or lever
- Sub Second
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
|---|
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 2.60 x 0.200 x 540 x 17.0 mm | DBH | Buy mainspring |
Incabloc Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
KIF Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
Documents
Parts Listing
| Part Description | Reference # | Alternate | Buy |
|---|---|---|---|
| CLICK | 1802/ELG | CAB 361/ELG | Buy part |
| CLICKSPRING | 1896/ELG | CAB 36/ELG | Buy part |
| CROWN WHEEL (MAIN) | 1498/ELG | Buy part | |
| FOURTH WHEEL W/O PINION | 1019/ELG | 1019/ELG | Buy part |
| HANDS, BLUE RAILROAD 95/165 | HAND N301 | HAND N301 | Buy part |
| MAINSPRING 2.60-.20-540 17 | MS-JA105 | GR 6801-DBH | Buy part |
| RATCHET WHEEL | 1501/ELG | Buy part | |
| ROLLER TABLE W/PIN (JEWEL) | 2068/ELG | 2068/ELG | Buy part |
| SETTING LEVER | 1443/ELG | Buy part | |
| STAFF, NEW .63 ROLLER 5.33 OA | 22BB/7 | 861/ELG P11 | Buy part |
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