Felsa 523 – interchangeable spare parts

Felsa 523 movement

Which spare parts fit the Felsa 523 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

29Parts with interchange data

2Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of Felsa 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
182ISO 20.030	Barrel and cover	AM 17
195ISO 20.060	Barrel arbor	AM 17
201ISO 30.015	Center wheel	AM 17
210ISO 30.025	Third wheel	AM 17
224ISO 30.027.13	Fourth wheel	AM 17
240ISO 31.080	Cannon-pinion	Height 275 AM 17 Height 300 AM 17
250ISO 31.046	Hour wheel	Height 170 AM 17 Height 195 AM 17
260ISO 31.041	Minute wheel	AM 17
301ISO 40.301	Regulator for flat hairspring	AM 17
311ISO 70.800	Upper cap jewel with end-piece	AM 17
330ISO 70.801	Lower cap jewel with end-piece	AM 17
336ISO 70.806	Upper cap-jewel with end-piece, for escape wheel	AM 17
401ISO 51.010	Winding stem	AM 17
407ISO 31.121	Clutch wheel	AM 17
410ISO 31.120	Winding pinion	AM 17
415ISO 31.020	Ratchet wheel	AM 17
420ISO 31.023	Crown wheel	AM 17
425ISO 51.120	Click	AM 17
430ISO 61.080	Click spring	AM 17
435ISO 51.050	Yoke	AM 17
440ISO 61.100	Yoke spring	AM 17
443ISO 51.080	Setting lever	AM 17
443/5443ISO 51.080.06/.01	Setting lever	AM 17
445ISO 51.090	Setting lever spring	AM 520
450ISO 31.100	Setting wheel	AM 17
453ISO 31.101	Intermediate setting wheel	AM 17
704ISO 30.040.10	Escape wheel and pinion, for upper end-piece	AM 17
705ISO 30.040	Escape wheel and pinion	AM 17
710ISO 40.010	Jewelled pallet fork and stat	AM 17

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

🌀 Matching mainspring

Mainspring dimensions for Felsa 523 (height × diameter × thickness × length) and matching mainspring in our shop:

Felsa 520 à 527: 1.40 × 15.0 × 0.18 × 480 mm (GR 3847)

📄 Technical document

View the original document for Felsa 523 online:

Felsa 523 – Ø 38.10 mm

❓ Frequently asked questions

Which Felsa 523 spare parts also fit other movements?

For the Felsa 523, 29 part numbers are listed as interchangeable. Together they fit 2 other calibers – the table below shows which part fits which movement.

Which mainspring fits the Felsa 523?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.40 × 15.0 × 0.18 × 480 mm (GR 3847, hand-wound, normal end hook).