EB 8423 – interchangeable spare parts

EB 8423 movement

Which spare parts fit the EB 8423 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

36Parts with interchange data

63Calibers sharing parts

Note: We have compiled this overview to the best of our knowledge and belief, based on the original interchangeability lists of EB 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.

🛒 Spare parts for EB 8423 in our shop

Third Wheel and Pinion for Bettlach EB 8423, EB 8461, EB 8481, EB 8497 – Part 210 – NOS15,00 € incl. VAT *View item ›

Fourth Wheel and Pinion, Two Long Pivots, for EB 8423, 8423-73, 8423-74 – Part 225 – NOS14,90 € incl. VAT *View item ›

Coupling Clutch, Mounted, for Ebauches Bettlach EB 8423, EB 8429 – Part 8080 – NOS14,90 € incl. VAT *View item ›

Coupling Clutch & Operating Lever Spring EB 8423, EB 8429-73 – Part 8320 / 8335 – NOS14,90 € incl. VAT *View item ›

Pin Pallet Cock for Ebauches Bettlach EB 8423 and EB 8429 – Part 125 – NOS11,90 € incl. VAT *View item ›

Core and Ratchet Wheel for Bettlach EB 8423 – Part 197 – NOS15,90 € incl. VAT *View item ›

More items for EB 8423 in our shop →

🔧 Interchangeable parts

Part no.	Description	Also fits
163/1ISO 80.400	Center pipe	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74
181/1ISO 20.040.06	Barrel for drilled core with driving wheel / driving pinion	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
197ISO 20.070.06	Core and ratchet wheel, riveted	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
199ISO 20.062	Barrel axle	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
203ISO 30.012	Intermediate wheel and pinion	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
210ISO 30.025	Third wheel	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
225ISO 30.028	Fourth wheel and pinion, two long pivots	EB 8423-73 EB 8423-74 Height 560 EB 8423-73 EB 8423-74 Height 583 EB 8423-73 EB 8423-74
243ISO 31.081	Cannon pinion without clam notch	EB 8423-73 EB 8423-74 Height 245 EB 8423-73 EB 8423-74
250ISO 31.046	Hour wheel	EB 8423-73 EB 8423-74 Height 153 EB 8423-73 EB 8423-74
260ISO 31.041	Minute wheel	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
307ISO 40.301	Regulator with adjustable stud holder, for flat hairspring	EB 8429 EB 8430 EB 8431 EB 8460 EB 8461 EB 8462 EB 8463 EB 8464 EB 8465 EB 8467 EB 8480 EB 8481 EB 8482 EB 8483 EB 8485 EB 8487 EB 8490 EB 8491 EB 8492 EB 8493 EB 8495 EB 8497
401ISO 51.010	Winding stem	EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74 according to original label EB 8429 EB 8430 EB 8431 EB 8450 EB 8461 EB 8462 EB 8463 EB 8464 EB 8465 EB 8467 EB 8480 EB 8481 EB 8482 EB 8483 EB 8485 EB 8487 EB 8490 EB 8491 EB 8492 EB 8493 EB 8495 EB 8497
407ISO 31.121	Clutch wheel	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
410ISO 31.120	Winding pinion	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
420ISO 31.023	Crown wheel	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
434ISO 51.120	Clicking spring	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
435/1ISO 51.050	Spring yoke	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
443/1ISO 51.080.06	Setting lever, assembled	EB 8423-73 EB 8429 EB 8429-73 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8461 EB 8461-73 EB 8462 EB 8462-73 EB 8463 EB 8463-73 EB 8464 EB 8465 EB 8465-73 EB 8467 EB 8467-73 EB 8480 EB 8480-73 EB 8481 EB 8481-73 EB 8482 EB 8482-73 EB 8483 EB 8483-73 EB 8485 EB 8485-73 EB 8487 EB 8487-73 EB 8490 EB 8490-73 EB 8491 EB 8491-73 EB 8492 EB 8492-73 EB 8493 EB 8493-73 EB 8495 EB 8495-73 EB 8497 EB 8497-73
450ISO 31.100	Setting wheel	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74
790ISO 30.041	Pin escape wheel, pivoted	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8430 EB 8431 EB 8460 EB 8460-73 EB 8460-74 EB 8461 EB 8461-73 EB 8461-74 EB 8462 EB 8462-73 EB 8462-74 EB 8463 EB 8463-73 EB 8463-74 EB 8464 EB 8465 EB 8465-73 EB 8465-74 EB 8467 EB 8467-73 EB 8467-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
792ISO 40.101.41	Balance staff for roller	EB 8429 EB 8430 EB 8431 EB 8460 EB 8461 EB 8462 EB 8463 EB 8464 EB 8465 EB 8467 EB 8480 EB 8481 EB 8482 EB 8483 EB 8485 EB 8487 EB 8490 EB 8491 EB 8492 EB 8493 EB 8495 EB 8497
793ISO 40.054	Balance with roller, regulated	EB 8429 EB 8429
794ISO 40.055	Balance with finger, regulated	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8481
797	Pin pallet fork for roller	according to original label EB 8423-73 EB 8429-73 EB 8480 EB 8480-73 EB 8481 EB 8481-73 EB 8482 EB 8482-73 EB 8483 EB 8483-73 EB 8485 EB 8485-73 EB 8487 EB 8487-73 EB 8490 EB 8490-73 EB 8491 EB 8491-73 EB 8492 EB 8492-73 EB 8493 EB 8493-73 EB 8495 EB 8495-73 EB 8497 EB 8497-73
799 = 799 DancISO 40.120		EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74 EB 8480 EB 8480-73 EB 8480-74 EB 8481 EB 8481-73 EB 8481-74 EB 8482 EB 8482-73 EB 8482-74 EB 8483 EB 8483-73 EB 8483-74 EB 8485 EB 8485-73 EB 8485-74 EB 8487 EB 8487-73 EB 8487-74 EB 8490 EB 8490-73 EB 8490-74 EB 8491 EB 8491-73 EB 8491-74 EB 8492 EB 8492-73 EB 8492-74 EB 8493 EB 8493-73 EB 8493-74 EB 8495 EB 8495-73 EB 8495-74 EB 8497 EB 8497-73 EB 8497-74
821/792ISO 40.101.26	Balance staff for roller and for shock-protecting device	EB 8429 EB 8430 EB 8431 EB 8460 EB 8461 EB 8462 EB 8463 EB 8464 EB 8465 EB 8467 EB 8480 EB 8481 EB 8482 EB 8483 EB 8485 EB 8487 EB 8490 EB 8491 EB 8492 EB 8493 EB 8495 EB 8497
8000ISO 35.010	Chronograph runner, mounted	EB 8423-73 EB 8423-74 Height 813 EB 8423-73 EB 8423-74
8026ISO 35.012.24		EB 8423-73 EB 8423-74 Height 663 EB 8423-73 EB 8423-74
8060ISO 35.060	Driving wheel	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74
8061ISO 35.061		EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74
8080ISO 55.220	Coupling clutch, mounted	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74
8219ISO 55.241	Hammer	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74
8231ISO 55.323		EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74
8235ISO 55.047		EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74
8290ISO 65.440	Friction spring	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74
8320ISO 65.160 = 8335 (65.041	Coupling clutch spring	EB 8423-73 EB 8423-74 EB 8429 EB 8429-73 EB 8429-74

Source: original interchangeability lists of EB (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 EB 8423 (height × diameter × thickness × length) and matching mainspring in our shop:

EB 8421 à 8429: 1.50 × 9.0 × 0.13 × 280 mm (GR 4194)

📄 Technical document

View the original document for EB 8423 online:

EB 8423-8429 – Ø 27.00 mm

🔗 Movements sharing the most parts

→ All calibers of EB

❓ Frequently asked questions

Which EB 8423 spare parts also fit other movements?

For the EB 8423, 36 part numbers are listed as interchangeable. Together they fit 63 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the EB 8423?

The most shared parts: EB 8423-73 (37 parts), EB 8423-74 (36 parts), EB 8429 (32 parts).

Which mainspring fits the EB 8423?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.50 × 9.0 × 0.13 × 280 mm (GR 4194, hand-wound, normal end hook).