Felsa 125 – interchangeable spare parts

Felsa 125 movement

Which spare parts fit the Felsa 125 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

24Parts with interchange data

1Calibers 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
181ISO 20.040	Barrel for drilled core	AM 125
197ISO 20.070.06	Core and ratchet wheel, riveted	AM 125
201ISO 30.015	Center wheel	AM 125
210ISO 30.025	Third wheel	AM 125
224ISO 30.027.13	Fourth wheel	AM 125
240ISO 31.080	Cannon-pinion	Height 305 AM 125 Height 350 AM 125 Height 390 AM 125
250ISO 31.046	Hour wheel	Height 190 AM 125 Height 235 AM 125 Height 275 AM 125
260ISO 31.041	Minute wheel	AM 125
301ISO 40.301	Regulator for flat hairspring	AM 125
311ISO 70.800	Upper cap jewel with end-piece	AM 125
330ISO 70.801	Lower cap jewel with end-piece	AM 125
401ISO 51.010	Winding stem	AM 125
411ISO 31.120	Winding pinion	AM 125
421ISO 31.025	Lower crown wheel	AM 125
434ISO 51.120	Clicking spring	AM 125
437ISO 51.052	Rocking bar	AM 125
439ISO 61.101	Rocking bar spring	AM 125
443ISO 51.080	Setting lever	AM 125
443/5443ISO 51.080.06/.01	Setting lever	AM 125
445ISO 51.090	Setting lever spring	AM 125
451ISO 31.102	Setting wheel for minute wheel	AM 125
452ISO 31.104	Ratchet-winding wheel	AM 125
705ISO 30.040	Escape wheel and pinion	AM 125
710ISO 40.010	Jewelled pallet fork and stat	AM 125

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 125 (height × diameter × thickness × length) and matching mainspring in our shop:

Felsa 125: 1.60 × 14.5 × 0.17 × 480 mm (GR 4653)

📄 Technical document

View the original document for Felsa 125 online:

Felsa 125 – Ø 35.52 mm

❓ Frequently asked questions

Which Felsa 125 spare parts also fit other movements?

For the Felsa 125, 24 part numbers are listed as interchangeable. Together they fit 1 other calibers – the table below shows which part fits which movement.

Which mainspring fits the Felsa 125?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.60 × 14.5 × 0.17 × 480 mm (GR 4653, hand-wound, normal end hook).