IWC 85-440, Yoke spring

• IWC original part in very good used condition. Picture of the actual part.
  

• Fits cal: 85, 851, 852, 8521, 853, 8531, 854, 854B, 8541, 8541B, 8541C
  

Versions: 13''' (1952 - 1964).

• 85:       center second.
• 851:     center second.
• 852:     center second (1952 - 1958).
• 8521:   center second (1953 - 1958).
• 853:     center second (1958 - 1963).
• 8531:   center second, date, H=6.40 mm (1959 - 1964).

Versions: 12,5''' (1964 - 1996).

• 854:       21-25 jewels, center second, H=4.85 mm (1964 - 1976).
• 854B:     23-25 jewels, stop mechanism, H=4.85 mm (?).
• 8541:     21-25 jewels, date, stop mechanism, H=5.90 mm (1964 - 1976).
• 8541B:   23-25 jewels, date, stop mechanism, H=5.90 mm (1976 - 1996).
• 8541C:

About our used parts!

All our used parts are cleaned and thoroughly checked by a watchmaker, often they comes from a working movement. Minor imperfections may occur, but nothing that affects the function.