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Ronda 1137-21
Ligne: 4 x 9'''
Jewels: 17
Power Reserve: 38 hrs
Frequency: 21600 vph
Type: Manual Wind
Period used: 1933-1939
Size: 8.95 x 20 mm
The Ronda 1137-21 watch movement, produced from 1933 to 1939, saw the creation of 77,000 units, making it the smallest movement produced in the United States. It is equipped with a bimetallic balance with pink-gold screws and utilizes a Breguet hairspring. Additionally, the movement features a safety barrel and is manually winded.
The Ronda 1137-21 features the following functions:
- Manual Winding
Mainspring Listing
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Incabloc Part Listing
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KIF Part Listing
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Documents
Parts Listing
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