Calibre catalogue / Extended reserve / 7M21A-3H
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7M21A-3H fitting drawing (PDF)
Dimensions, stem height and hand fitting. Keyed to the base calibre, so sibling references share this drawing. Supplied for casing and fitting purposes only.
Extended reserve
7M21A-3H
7 Series
- —Small seconds
- —Date
| Specification | |
|---|---|
| Size | 33 mm (1.299 in) |
| Height | 5.73 mm (0.226 in) |
| Jewels | 27 |
| Frequency | 28,800 vph (4 Hz) |
| Power reserve | 80 h |
| Finish colour | White |
| Crown position | 3 o’clock |
Check dimensions against the fitting drawing before tooling a case.
