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Felsa 4550 – interchangeable spare parts
Felsa 4550 movement
Which spare parts fit the Felsa 4550 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.
29Parts with interchange data
9Calibers 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 | |
| 195ISO 20.060 | Barrel arbor | |
| 206ISO 30.015 | Center wheel | |
| 210ISO 30.025 | Third wheel | |
| 227ISO 30.027 | Sweep second wheel | Height 499 Height 524 Height 549 |
| 245ISO 31.080 | Cannon pinion with clam notch | |
| 255ISO 31.046 | Hour wheel | |
| 260ISO 31.041 | Minute wheel | |
| 307ISO 40.301 | Regulator with adjustable stud holder, 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 | |
| 407ISO 31.121 | Clutch wheel | |
| 410 | Winding pinion | |
| 415ISO 31.020 | Ratchet wheel | |
| 420ISO 31.023 | Crown wheel | |
| 423ISO 81.136 | Crown wheel core | |
| 425ISO 51.120 | Click | |
| 430ISO 61.080 | Click spring | |
| 435ISO 51.050 | Yoke | |
| 440ISO 61.100 | Yoke spring | |
| 443ISO 51.080 | Setting lever | |
| 443/5443ISO 51.080.06/.01 | Setting lever | |
| 445ISO 51.090 | Setting lever spring | |
| 450ISO 31.100 | Setting wheel | |
| 462ISO 10.062 | Minute work cock | |
| 702ISO 30.040.12 | Escape wheel and pinion, pivoted, for two end-pieces |
Source: original interchangeability lists of Felsa (checked transcription) and checked original spare-part labels · as of 2026-10-17. Height / execution: the part fits only in this height or execution.