IWC 853-724, Balance staff

• IWC original balance staff, not in factory packaging.
• 1 pcs.

• Fits cal: 853, 8531, C8531

Versions: 13''' (1958 - 1963).

• 853: center second.
• 8531: center second, date, H=6,40 mm.

Versions: 12,5''' (1963 - 1974).

• 854: 21-25 jewels, center second, H=4,85 mm.
• 854B: 23-25 jewels, stop mechanism, H=4,85 mm.
• 8541: 21-25 jewels, date, stop mechanism, H=5,90 mm.
• 8541B: 23-25 jewels, date, stop mechanism, H=5,90 mm.