EB 8320 – interchangeable spare parts

EB 8320 movement

Which spare parts fit the EB 8320 movement? For every part you can see which other calibers use the same part according to the original interchangeability list.

28Parts with interchange data

56Calibers 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 8320 in our shop

Center Wheel (? Intermediate Wheel) for Bettlach EB 8397, Part 201, EB 8320, EB 8340, EB 8370 – NOS12,90 € incl. VAT *View item ›

Third Wheel and Pinion for Bettlach EB 8397, Part 210, EB 8320, EB 8340, EB 8370 – NOS12,90 € incl. VAT *View item ›

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

Coupling Clutch Spring + Operating Lever Spring EB 8423, 8429-73 – Part 8320 / 8335 – NOS16,90 € incl. VAT *View item ›

Third Wheel and Pinion for Bettlach EB 8340, EB 8320, 8321, 8330, 8331, 8341 – Part 210 – NOS10,90 € incl. VAT *View item ›

Intermediate Wheel and Pinion, Part 203 – Bettlach EB 8320, 8321, 8330, 8331, 8340, 834113,90 € incl. VAT *View item ›

🔧 Interchangeable parts

Part no.	Description	Also fits
163/1ISO 80.400	Center pipe	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8381 EB 8381-66 EB 8381-67 EB 8391-66 EB 8391-67 Height 135 EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8381 EB 8381-66 EB 8381-67 EB 8391-66 EB 8391-67
181/1ISO 20.040.06	Barrel for drilled core with driving wheel / driving pinion	2nd execution EB 8320-66 EB 8321 EB 8321-66 EB 8330-66 EB 8331-66
197ISO 20.070.06	Core and ratchet wheel, riveted	2nd execution EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67
199ISO 20.062	Barrel axle	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
203ISO 30.012	Intermediate wheel and pinion	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
210ISO 30.025	Third wheel	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67 according to original label EB 8321 EB 8330-66 EB 8331-66 EB 8340 EB 8341 EB 8350 EB 8361 EB 8370 EB 8371-67 EB 8381
220ISO 30.027	Fourth wheel	EB 8320-66 EB 8320-67 EB 8330-66 EB 8330-67 EB 8340 EB 8340-66 EB 8340-67 EB 8364-67 EB 8376-66 EB 8376-67
243/1ISO 31.081.18	Cannon pinion, undrilled, without clam notch, smooth hole	EB 8320-66 EB 8320-67 EB 8330-66 EB 8330-67 EB 8340 EB 8340-66 EB 8340-67 EB 8350 EB 8350-66 EB 8350-67 EB 8370 EB 8370-66 EB 8370-67 Height 215 EB 8320-66 EB 8320-67 EB 8330-66 EB 8330-67 EB 8340 EB 8340-66 EB 8340-67 EB 8350 EB 8350-66 EB 8350-67 EB 8370 EB 8370-66 EB 8370-67 Height 245 EB 8320-66 EB 8320-67 EB 8330-66 EB 8330-67 EB 8340 EB 8340-66 EB 8340-67 EB 8350 EB 8350-66 EB 8350-67 EB 8370 EB 8370-66 EB 8370-67
250ISO 31.046	Hour wheel	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8361 EB 8361-66 EB 8361-67 EB 8370 EB 8370-66 EB 8370-67 EB 8381 EB 8381-66 EB 8381-67 EB 8391-66 EB 8391-67 Height 117 EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8361 EB 8361-66 EB 8361-67 EB 8370 EB 8370-66 EB 8370-67 EB 8381 EB 8381-66 EB 8381-67 EB 8391-66 EB 8391-67 Height 150 EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8361 EB 8361-66 EB 8361-67 EB 8370 EB 8370-66 EB 8370-67 EB 8381 EB 8381-66 EB 8381-67 EB 8391-66 EB 8391-67
260ISO 31.041	Minute wheel	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
307ISO 40.301	Regulator with adjustable stud holder, for flat hairspring	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67
311ISO 70.800	Upper cap jewel with end-piece	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67 EB 9391-67
330ISO 70.801	Lower cap jewel with end-piece	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
401ISO 51.010	Winding stem	EB 8320-66 EB 8321 EB 8321-66 EB 8330-66 EB 8331-66 EB 8340 EB 8340-66 EB 8341 EB 8341-66 EB 8350 EB 8350-66 EB 8354-66 EB 8361 EB 8361-66 EB 8365-66 EB 8370 EB 8370-66 EB 8374-66 EB 8376-66 EB 8381 EB 8381-66 EB 8385-66 EB 8387-66 EB 8391-66 EB 8395-66 EB 8397-66
407ISO 31.121	Clutch wheel	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
410ISO 31.120	Winding pinion	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
420ISO 31.023	Crown wheel	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
425ISO 51.120	Click	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
430ISO 61.080	Click spring	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
435/1ISO 51.050	Spring yoke	EB 8320-66 EB 8321 EB 8321-66 EB 8330-66 EB 8331-66 EB 8340 EB 8340-66 EB 8341 EB 8341-66 EB 8350 EB 8350-66 EB 8354-66 EB 8361 EB 8361-66 EB 8365-66 EB 8370 EB 8370-66 EB 8374-66 EB 8376-66 EB 8381 EB 8381-66 EB 8385-66 EB 8387-66 EB 8391-66 EB 8395-66 EB 8397-66
443/1ISO 51.080.06	Setting lever, assembled	EB 8321 EB 8340 EB 8341 EB 8350 EB 8361 EB 8370 EB 8381
450ISO 31.100	Setting wheel	EB 8135 EB 8137 EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 2e EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67 1st execution EB 8115 EB 8135 EB 8137 EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 2e EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
790ISO 30.041	Pin escape wheel, pivoted	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
792ISO 41.101.41	Balance staff for roller	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67
793ISO 40.054	Balance with roller, regulated	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67
794ISO 40.055	Balance with finger, regulated	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340
799/4ISO 40.123	Small roller	EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67
821/792ISO 40.101.26	Balance staff for roller and for shock-protecting device	EB 8135 EB 8137 EB 8155 EB 8157 EB 8175 EB 8177 EB 8320-66 EB 8320-67 EB 8321 EB 8321-66 EB 8321-67 EB 8330-66 EB 8330-67 EB 8331-66 EB 8331-67 EB 8340 EB 8340-66 EB 8340-67 EB 8341 EB 8341-66 EB 8341-67 EB 8350 EB 8350-66 EB 8350-67 EB 8354-66 EB 8354-67 EB 8361 EB 8361-66 EB 8361-67 EB 8364-67 EB 8365-66 EB 8365-67 EB 8370 EB 8370-66 EB 8370-67 EB 8371-67 EB 8374-66 EB 8374-67 EB 8376-66 EB 8376-67 EB 8381 EB 8381-66 EB 8381-67 EB 8385-66 EB 8385-67 EB 8387-66 EB 8387-67 EB 8391-66 EB 8391-67 EB 8395-66 EB 8395-67 EB 8397-66 EB 8397-67 EB 8398-67

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 8320 (height × diameter × thickness × length) and matching mainspring in our shop:

EB 8320: 1.55 × 7.0 × 0.08 × 260 mm (GR 4378)

🔗 Movements sharing the most parts

→ All calibers of EB

❓ Frequently asked questions

Which EB 8320 spare parts also fit other movements?

For the EB 8320, 28 part numbers are listed as interchangeable. Together they fit 56 other calibers – the table below shows which part fits which movement.

Which movements share the most parts with the EB 8320?

The most shared parts: EB 8320-66 (34 parts), EB 8330-66 (34 parts), EB 8321 (32 parts).

Which mainspring fits the EB 8320?

According to the Générale Ressorts catalogue (height × diameter × thickness × length): 1.55 × 7.0 × 0.08 × 260 mm (GR 4378, hand-wound, normal end hook).