INT.S 378 – interchangeable spare parts

INT.S 378 movement

Which spare parts fit the INT.S 378 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

34Parts with interchange data

10Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of INT.S 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	INT.S 37 INT.S 374
195ISO 20.060	Barrel arbor	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
206ISO 30.015	Center wheel	FHF 37 INT.S 37 INT.S 374
210ISO 30.025	Third wheel	FHF 37 INT.S 37 INT.S 374
227ISO 30.027	Sweep second wheel	Height 621 FHF 37 INT.S 37 INT.S 374 Height 646 FHF 37 INT.S 37 INT.S 374
245ISO 31.080	Cannon pinion with clam notch	Height 248 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374 Height 273 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
255ISO 31.046	Hour wheel	Height 198 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374 Height 223 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
260ISO 31.041	Minute wheel	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
307ISO 40.301	Regulator with adjustable stud holder, for flat hairspring	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
311ISO 70.800	Upper cap jewel with end-piece	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
330ISO 70.801	Lower cap jewel with end-piece	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
401ISO 51.010	Winding stem	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
407ISO 31.121	Clutch wheel	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
410ISO 31.120	Winding pinion	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
415ISO 31.020	Ratchet wheel	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
420ISO 31.023	Crown wheel	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
425ISO 51.120	Click	FHF 90-5 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
430ISO 61.080	Click spring	FHF 90-5 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
435ISO 51.050	Yoke	INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
440ISO 61.100	Yoke spring	INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
443/1ISO 51.080.06	Setting lever, assembled	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
450ISO 31.100	Setting wheel	FHF 37 INT.S 37 INT.S 371 INT.S 372 INT.S 373 INT.S 374
482ISO 61.092	Setting lever return-spring	FHF 374 INT.S 372 INT.S 373 INT.S 374
705ISO 30.040	Escape wheel and pinion	FHF 37 INT.S 37 INT.S 374
2535ISO 13.105	Date indicator guard	FHF 373 FHF 378 FHF 378 INT.S 373
2543ISO 33.011	Intermediate date wheel	FHF 374 INT.S 374
2554ISO 53.161		FHF 373 FHF 378 FHF 378 INT.S 373
2556/1ISO 33.020.06	Date indicator driving wheel	FHF 374 INT.S 374
2557/1ISO 91.440	Date indicator, transferred	FHF 373 FHF 378 FHF 378 INT.S 373
2561/1ISO 91.441	Day indicator, for horizontal rectangular window opening at 3 o'clock	FHF 373 FHF 378 FHF 378 INT.S 373
2575ISO 63.030	Date jumper spring	INT.S 372 INT.S 373 INT.S 374
2576ISO 53.080	Date jumper, mounted	FHF 374 INT.S 372 INT.S 373 INT.S 374
2577ISO 53.081	Day jumper	FHF 373 FHF 378 FHF 378 INT.S 373
2780ISO 83.171	Day indicator spring-clip	FHF 373 FHF 378 FHF 378 INT.S 373

Source: original interchangeability lists of INT.S (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 INT.S 378 (height × diameter × thickness × length) and matching mainspring in our shop:

INT.S 378: 1.40 × 8.0 × 0.085 × 300 mm (GR 3617)

🔗 Movements sharing the most parts

→ All calibers of INT.S

❓ Frequently asked questions

Which INT.S 378 spare parts also fit other movements?

For the INT.S 378, 34 part numbers are listed as interchangeable. Together they fit 10 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the INT.S 378?

The most shared parts: INT.S 374 (31 parts), INT.S 373 (29 parts), INT.S 37 (26 parts).

Which mainspring fits the INT.S 378?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.40 × 8.0 × 0.085 × 300 mm (GR 3617, hand-wound, normal end hook).