FEF 6665-1 – interchangeable spare parts

FEF 6665-1 movement

Which spare parts fit the FEF 6665-1 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

3Parts with interchange data

16Calibers 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
443/1	Setting lever, assembled	according to original label FEF 5765-1 FEF 6630 FEF 6631 FEF 6632 FEF 6633 FEF 6664 FEF 6665 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764 FEF 6765
445	Setting lever spring	according to original label FEF 6660 FEF 6662 FEF 6664 FEF 6665 FEF 6764 FEF 6765 FEF 6765-1
2558	Double-toothing hour wheel	Height 212according to original label FEF 6664 FEF 6665 FEF 6764 FEF 6765 FEF 6765-1

Source: original interchangeability lists of FEF (checked transcription) and checked original spare-part labels · as of 2026-10-28. Height / execution: the part fits only in this height or execution.

🔗 Movements sharing the most parts

→ All calibers of FEF

❓ Frequently asked questions

Which FEF 6665-1 spare parts also fit other movements?

For the FEF 6665-1, 3 part numbers are listed as interchangeable. Together they fit 16 other calibers – the table below shows which part fits which movement.