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Description
- OMEGA original balance staff, not in factory packaging.
- Fits cal: 490, 491, 500, 501, 502, 503, 504, 505
Versions: 25.00 mm.
- 470: 17 jewels (1955).
- 471: 19/20 jewels (1955).
Versions: 28.00 mm.
- 490: 17 jewels, sub second (1956).
- 491: 19 jewels, sub second (1956).
- 500: 17 jewels, center second (1956).
- 501: 20 jewels, center second (1956).
- 502: 17 jewels, center second, date (1956).
- 503: 19/20 jewels, center second, date (1956).
- 504: 24 jewels, center second, date, chronometer (1957).
- 505: 24 jewels, center second, chronometer (1957).
