Four ball bearing races, for regulator timepiece employing Grimthorpe's four-legged gravity escapement, by A. V. Parlby, British, 1937
Details
- Category:
- Time Measurement
- Object Number:
- 1962-47/2
- type:
- ball bearing races
- credit:
- Parlby, A.V.
Four ball bearing races, for regulator timepiece employing Grimthorpe's four-legged gravity escapement, by A. V. Parlby, British, 1937