FHF 77-21 – interchangeable spare parts

FHF 77-21 movement

Which spare parts fit the FHF 77-21 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

15Parts with interchange data
51Calibers sharing parts
Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of FHF and the original spare-part labels. All information has been carefully checked but is provided without guarantee. Please verify the interchangeability yourself before fitting, especially the height, diameter and execution of the part.

🔧 Interchangeable parts

Part no.DescriptionAlso fits
240ISO 31.080Cannon-pinion
250ISO 31.046Hour wheel
Height 185according to original label
250/255Hour wheel
Height 110according to original label
260ISO 31.041Minute wheel
311ISO 70.800Upper cap jewel with end-piece
330ISO 70.801Lower cap jewel with end-piece
346ISO 70.807Lower cap jewel with end-piece, f. esc. wheel
401ISO 51.010Winding stem
407ISO 31.121Clutch wheel
410ISO 31.120Winding pinion
425ISO 51.120Click
430ISO 61.080Click spring
435ISO 51.050Yoke
440ISO 61.100Yoke spring
450ISO 31.100Setting wheel

Source: original interchangeability lists of FHF (checked transcription) and checked original spare-part labels · as of 2026-10-17. Height / execution: the part fits only in this height or execution.

🌀 Matching mainspring

Mainspring dimensions for FHF 77-21 (height × diameter × thickness × length) and matching mainspring in our shop:

🔗 Movements sharing the most parts

→ All calibers of FHF

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