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Gruen 487
Ligne: 16.5'''
Jewels: 15
Frequency: 18000 vph
Type: Manual Wind
Period used: ~1940
Diameter: 37.2 mm
Height: 4.9 mm
Hands: 2.00 x 1.15 / 0.27 mm
The Gruen 487 is an open face calibre watch movement. It features varying bridge shapes and is believed to include a left-handed ratchet-wheel screw. Not much is known about the differences between the 283, 291, 297, 309, 329, 333, 337, and 499 calibres. The Gruen 487 movement offers the functions of stem winding and setting, as well as a sub-second display. It was commonly used during the approximate period of 1940.
The Gruen 487 features the following functions:
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 1.90 x 0.170 x 460 x 15.0 mm | Manual | Buy mainspring | |
| 1.90 x 0.170 x 460 x 14.0 mm | GR5608 | 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) |
|---|
Documents
Parts Listing
| Part Description | Reference # | Alternate | Buy |
|---|
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