Unitas 6503 – interchangeable spare parts

Unitas (UT) 6503 movement

Which spare parts fit the Unitas 6503 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

33Parts with interchange data

46Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of Unitas (UT) 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	Unitas 285 Unitas 286 Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
195ISO 20.060	Barrel arbor	Unitas 6497 Unitas 6498
201ISO 30.015	Center wheel	Unitas 285 Unitas 286 Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
210ISO 30.025	Third wheel	Unitas 285 Unitas 497 Unitas 6497 Unitas 6500
240ISO 31.080	Cannon-pinion	Unitas 6500 Height 340 Unitas 6500
260ISO 31.041	Minute wheel	Unitas 285 Unitas 286 Unitas 287 Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
307ISO 40.301	Regulator with adjustable stud holder, for flat hairspring	Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
311ISO 70.800	Upper cap jewel with end-piece	Unitas 6497 Unitas 6498
330ISO 70.801	Lower cap jewel with end-piece	Unitas 6497 Unitas 6498
336ISO 70.806	Upper cap-jewel with end-piece, for escape wheel	Unitas 6497 Unitas 6498
346ISO 70.807	Lower cap jewel with end-piece, f. esc. wheel	Unitas 6497 Unitas 6498
401ISO 51.010	Winding stem	Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 444 Unitas 497 Unitas 498 Unitas 6497 Unitas 6500
407ISO 31.121	Clutch wheel	Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 444 Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
410ISO 31.120	Winding pinion	Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 444 Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
415ISO 31.020	Ratchet wheel	Unitas 285 Unitas 286 Unitas 287 Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
420ISO 31.023	Crown wheel	Unitas 285 Unitas 286 Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
422ISO 81.067	Crown wheel ring	Unitas 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 429 Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6497 Unitas 6498 Unitas 6500
425ISO 51.120	Click	Unitas 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6497 Unitas 6498 Unitas 6500
430ISO 61.080	Click spring	Unitas 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 287 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6497 Unitas 6498 Unitas 6500
435ISO 51.050	Yoke	Unitas 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6461 Unitas 6497 Unitas 6498 Unitas 6500
440ISO 61.100	Yoke spring	Unitas 231 Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 343 Unitas 429 Unitas 429N Unitas 431 Unitas 432 Unitas 444 Unitas 445 Unitas 446 Unitas 497 Unitas 498 Unitas 6431 Unitas 6445 Unitas 6461 Unitas 6497 Unitas 6498 Unitas 6500
443ISO 51.080	Setting lever	Unitas 6497
443/5443ISO 51.080.06/.01	Setting lever	Unitas 6497
445ISO 51.090	Setting lever spring	Unitas 6431 Unitas 6445 Unitas 6461 Unitas 6497
450ISO 31.100	Setting wheel	Unitas 233 Unitas 234 Unitas 285 Unitas 286 Unitas 444 Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
453ISO 31.101	Intermediate setting wheel	Unitas 285 Unitas 286 Unitas 497 Unitas 498 Unitas 6497 Unitas 6498 Unitas 6500
705ISO 30.040	Escape wheel and pinion	Unitas 6497 Unitas 6498
2535ISO 13.105	Date indicator guard	Unitas 6500
2556ISO 33.020	Date indicator driving wheel	Unitas 6500
2557/1ISO 91.440	Date indicator, transferred	Unitas 6500
2558ISO 33.010	Double-toothing hour wheel	Unitas 6500 Height 240 Unitas 6500
2575ISO 63.030	Date jumper spring	Unitas 376 Unitas 650 Unitas 6305 Unitas 6305N Unitas 6308 Unitas 6380 Unitas 6410 Unitas 6410N Unitas 6411 Unitas 6411N Unitas 6412 Unitas 6412N Unitas 6415 Unitas 6415N Unitas 6425 Unitas 6426 Unitas 6427 Unitas 6428 Unitas 6450 Unitas 6450N Unitas 6452 Unitas 6452N Unitas 6460 Unitas 6460N Unitas 6500
2576ISO 53.080	Date jumper, mounted	Unitas 376 Unitas 650 Unitas 6305 Unitas 6305N Unitas 6308 Unitas 6380 Unitas 6410 Unitas 6410N Unitas 6411 Unitas 6411N Unitas 6412 Unitas 6412N Unitas 6415 Unitas 6415N Unitas 6425 Unitas 6426 Unitas 6427 Unitas 6428 Unitas 6450 Unitas 6450N Unitas 6452 Unitas 6452N Unitas 6460 Unitas 6460N Unitas 6500

Source: original interchangeability lists of Unitas (UT) (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 Unitas 6503 (height × diameter × thickness × length) and matching mainspring in our shop:

Unitas 6503: 1.50 × 14.5 × 0.175 × 440 mm (GR 4307-1)

🔗 Movements sharing the most parts

→ All calibers of Unitas (UT)

❓ Frequently asked questions

Which Unitas 6503 spare parts also fit other movements?

For the Unitas 6503, 33 part numbers are listed as interchangeable. Together they fit 46 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the Unitas 6503?

The most shared parts: Unitas 6497 (26 parts), Unitas 6500 (26 parts), Unitas 6498 (21 parts).

Which mainspring fits the Unitas 6503?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.50 × 14.5 × 0.175 × 440 mm (GR 4307-1, hand-wound, special version (1)).