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FEF 250 – interchangeable spare parts
FEF 250 movement
Which spare parts fit the FEF 250 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.
15Parts with interchange data
29Calibers sharing parts
Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of FEF 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. | Description | Also fits |
|---|---|---|
| 255ISO 31.046 | Hour wheel | |
| 301ISO 40.301 | Regulator for flat hairspring | |
| 311ISO 70.800 | Upper cap jewel with end-piece | |
| 330ISO 70.801 | Lower cap jewel with end-piece | |
| 336ISO 70.806 | Upper cap-jewel with end-piece, for escape wheel | |
| 346ISO 70.807 | Lower cap jewel with end-piece, f. esc. wheel | |
| 401ISO 51.010 | Winding stem | |
| 410ISO 31.120 | Winding pinion | |
| 420ISO 31.023 | Crown wheel | |
| 423ISO 81.136 | Crown wheel core | |
| 425ISO 51.120 | Click | |
| 430ISO 61.080 | Click spring | |
| 443ISO 51.080 | Setting lever | |
| 443/5443ISO 51.080.06/.01 | Setting lever | |
| 710ISO 40.010 | Jewelled pallet fork and stat |
Source: original interchangeability lists of FEF (checked transcription) and checked original spare-part labels · as of 2026-10-17. Height / execution: the part fits only in this height or execution.