Watch Database
Gruen 431
Ligne: 17'''
Jewels: 15
Power Reserve: 32 hrs
Frequency: 18000 vph
Type: Manual Wind
Period used: ~1930
Diameter: 37.8 mm
Height: 3.85 mm
Hands: 1.75 x 1.10 / 0.22 mm
The Gruen 431 watch movement is a hunter calibre with a Breguet hairspring. The differences between the 784 and 786 are not known. The movement features functions such as stem wind and set, as well as a sub-second hand. It was commonly used around the period of 1930.
The Gruen 431 features the following functions:
- Stem wind and set
- Sub Second
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
|---|
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.40 x 0.180 x 480 x 15.0 mm | GR3847 | Manual | Buy mainspring |
| 1.40 x 0.190 x 430 x 15.0 mm | Manual | 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) |
|---|
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