FEF 6664 – interchangeable spare parts

FEF 6664 movement

Which spare parts fit the FEF 6664 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

36Parts with interchange data

58Calibers 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.

🛒 Spare parts for FEF 6664 in our shop

Complete Balance ST 69-21 – Part 721 – for FHF 60-21, ST 69N, 691, 691N, FEF 6664 – NOS22,90 € – 27,90 € incl. VAT *View item ›

Jewelled Pallet Fork and Staff FHF 69-21, 692, ST 69-21, FEF 6664, 6665, 6765 – Part 71018,80 € incl. VAT *View item ›

Balance Complete Part 721 for ST 69-21, 69N, 691, 691N, FHF 60-21, FEF 6664, 6765 – NOS24,90 € incl. VAT *View item ›

🔧 Interchangeable parts

Part no.	Description	Also fits
182ISO 20.030	Barrel and cover	FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 6660 FEF 6662 FEF 6665 FEF 6764 FEF 6765
195ISO 20.060	Barrel arbor	FEF 6660 FEF 6662 FEF 6665 FEF 6764 FEF 6765 2nd execution FEF 373 FEF 6660 FEF 6662 FEF 6665 FEF 6764 FEF 6765
201ISO 30.015	Center wheel	FEF 6660 FEF 6662 FEF 6665
210ISO 30.025	Third wheel	FEF 6660 FEF 6662 FEF 6764
220ISO 30.027	Fourth wheel	FEF 6660 FEF 6662
240ISO 31.080	Cannon-pinion	FEF 6665 Height 195 FEF 6665 Height 210 FEF 6665 Height 245 FEF 6665 Height 270 FEF 6665
250ISO 31.046	Hour wheel	FEF 6665 Height 106 FEF 6665 Height 121 FEF 6665 Height 156 FEF 6665 Height 181 FEF 6665
255ISO 31.046	Hour wheel	1st execution FEF 6764 FEF 6765
260ISO 31.041	Minute wheel	FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 1270 FEF 6660 FEF 6662 FEF 6665 FEF 6764 FEF 6765
307ISO 40.301	Regulator with adjustable stud holder, for flat hairspring	FEF 6665 FEF 6764 FEF 6765
311ISO 70.800	Upper cap jewel with end-piece	FEF 6665 FEF 6764 FEF 6765
330ISO 70.801	Lower cap jewel with end-piece	FEF 6665 FEF 6764 FEF 6765
336ISO 70.806	Upper cap-jewel with end-piece, for escape wheel	FEF 6665
346ISO 70.807	Lower cap jewel with end-piece, f. esc. wheel	FEF 6665
401ISO 51.010	Winding stem	FEF 6630 FEF 6631 FEF 6632 FEF 6633 FEF 6665 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764 FEF 6765
407ISO 31.121	Clutch wheel	FEF 165 FEF 166 FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 430 FEF 1270 FEF 6600 FEF 6620 FEF 6621 FEF 6630 FEF 6631 FEF 6640 FEF 6650 FEF 6660 FEF 6662 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764
410ISO 31.120	Winding pinion	FEF 6630 FEF 6631 FEF 6632 FEF 6633 FEF 6665 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764 FEF 6765 2nd execution FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 430 FEF 6600 FEF 6620 FEF 6621 FEF 6630 FEF 6631 FEF 6632 FEF 6633 FEF 6650 FEF 6660 FEF 6662 FEF 6665 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764 FEF 6765
415ISO 31.020	Ratchet wheel	FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 6660 FEF 6662 FEF 6665 FEF 6764 FEF 6765
420ISO 31.023	Crown wheel	FEF 6665 FEF 6681 FEF 6687 FEF 6764 FEF 6765
422ISO 81.067	Crown wheel ring	FEF 6665 FEF 6670 FEF 6676 FEF 6677 FEF 6681 FEF 6687 FEF 6764 FEF 6765 FEF 6870 FEF 6876
425ISO 51.120	Click	FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 400 FEF 401 FEF 430 FEF 1270 FEF 6600 FEF 6620 FEF 6621 FEF 6630 FEF 6631 FEF 6650 FEF 6660 FEF 6662 FEF 6665 FEF 6680 FEF 6686 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764 FEF 6765
430ISO 61.080	Click spring	FEF 165 FEF 166 FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 400 FEF 401 FEF 430 FEF 1270 FEF 6600 FEF 6620 FEF 6621 FEF 6630 FEF 6631 FEF 6640 FEF 6650 FEF 6660 FEF 6662 FEF 6665 FEF 6680 FEF 6686 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764 FEF 6765
435ISO 51.050	Yoke	FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 1270 FEF 6660 FEF 6662 FEF 6665 FEF 6764 FEF 6765
440ISO 61.100	Yoke spring	FEF 150 FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 1270 FEF 6660 FEF 6662 FEF 6665 FEF 6764 FEF 6765
443/1ISO 51.080.06	Setting lever, assembled	FEF 6630 FEF 6631 FEF 6632 FEF 6633 FEF 6665 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764 FEF 6765 according to original label FEF 5765-1 FEF 6630 FEF 6631 FEF 6632 FEF 6633 FEF 6665 FEF 6665-1 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764 FEF 6765
445ISO 51.090	Setting lever spring	FEF 6660 FEF 6662 FEF 6665 FEF 6764 FEF 6765 according to original label FEF 6660 FEF 6662 FEF 6665 FEF 6665-1 FEF 6764 FEF 6765 FEF 6765-1
450ISO 31.100	Setting wheel	FEF 165 FEF 166 FEF 270 FEF 370 FEF 371 FEF 371N FEF 372 FEF 373 FEF 430 FEF 1270 FEF 6600 FEF 6620 FEF 6621 FEF 6630 FEF 6631 FEF 6640 FEF 6650 FEF 6660 FEF 6662 FEF 6700 FEF 6701 FEF 6710 FEF 6711 FEF 6764
702ISO 30.040.12	Escape wheel and pinion, pivoted, for two end-pieces	FEF 6660
705ISO 30.040	Escape wheel and pinion	FEF 6660 FEF 6764
710ISO 40.010	Jewelled pallet fork and stat	FEF 6665 FEF 6764 FEF 6765 FHF 692 Durowe 69-21 INT.S 69-21 ST 69 FHF 98 FHF 98-1 FHF 692 FHF 984 FHF 984-1 Durowe 69-21 INT.S 69-21 ST 69 Durowe 69-21 INT.S 69-21 ST 69 FHF 692 Durowe 69-21 INT.S 69-21 ST 69 ST 69-21 ST 69N ST 691 ST 691N
2535ISO 13.105 M6	Date indicator guard	FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N
2556ISO 33.020 M6	Date indicator driving wheel	FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N
2557/1ISO 91.440 M6	Date indicator, transferred	FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N
2558ISO 33.010 M6	Double-toothing hour wheel	Height 212 INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 Height 212 INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 Height 212according to original label FEF 6665 FEF 6665-1 FEF 6764 FEF 6765 FEF 6765-1 Height 237 INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 Height 237 INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691
2575ISO 63.030 M 6	Date jumper spring	FEF 6665 FEF 6764 FEF 6765 FHF 692INT.S 3.69ST 69-21 FEF 6665 FEF 6764 FEF 6765 FHF 692INT.S 3.69ST 69-21 FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N
2576ISO 53.080 M 6	Date jumper, mounted	FEF 6665 FEF 6764 FEF 6765 FHF 692INT.S 3.69ST 69-21 FEF 6665 FEF 6764 FEF 6765 FHF 692INT.S 3.69ST 69-21 FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N FHF 692INT.S 3.69INT.S 3.691INT.S 69-21 INT.S 691 ST 69-21 FHF 692INT.S 3.69ST 69-21 ST 69N ST 691 ST 691N

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.

📄 Technical document

View the original document for FEF 6664 online:

FEF 6664 – 15.30 x 17.80 mm

🔗 Movements sharing the most parts

→ All calibers of FEF

❓ Frequently asked questions

Which FEF 6664 spare parts also fit other movements?

For the FEF 6664, 36 part numbers are listed as interchangeable. Together they fit 58 other calibers – the table below shows which part fits which movement.