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Gruen 731CD
Ligne: 11.5'''
Jewels: 25
Power Reserve: 33 hrs
Frequency: 18000 vph
Type: Automatic
Period used: ~1955
Diameter: 26 mm
Height: 6.2 mm
Hands: 1.30 x 0.80 x 0.22 mm
The Gruen 731CD watch movement was developed in 1955 and features a detached manual wind mechanism with wheels made of beryllium bronze. There were two variants of the manual wind gear and two balances produced in parallel, which suggests an experimental nature. The movement includes functions such as automatic winding and a sweep second hand. It was primarily used during the approximate period of 1955.
The Gruen 731CD features the following functions:
- Automatic Winding
- Sweep Seconds
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.20 x 0.100 x 280 x 9.0 mm | GR2919X | Auto | 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
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