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The Gruen 215SS watch movement is equipped with a bimetallic screw balance. This movement is manually wound and offers the option of a digital display indicating minutes and jumping hours. It was commonly used around the 1935 period.
The Gruen 215SS features the following functions:
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.15 x 0.085 x 240 x 7.0 mm | GR2790 | Manual | Buy mainspring |
| 1.15 x 0.080 x 220 x 7.0 mm | Manual | Buy mainspring | |
| 1.10 x 0.080 x 240 x 7.0 mm | GR2579 | Manual | Buy mainspring |
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
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| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
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