The IWC Calibre 85 Movement Family Prepared by  Michael Friedberg Copyright 2000 Please do not reproduce or link without express written permission of the author
Calibre	81	85	852	8521	853	8531	854	8541	8541B	5000
Produced	1950-51	1950-51	1952-58	1953-58	1958-63	1959-64	1964-76	1964-76	1976-96	2000-01
Total	1,800	8,400	49,200	13,200	85,200	55,200	40,200	?	?	2,000
Diameter (lignes)	12.75	varied	12.75	12.75	12.75	12.75	12.5	12.5	12.5	16.75
Diameter (mm)	29mm	varied	29mm	29mm	29mm	29mm	28mm	28mm	28mm	37.80mm
Height	5.05mm	5.45mm	5.60mm	6.40mm	5.60mm	6.40mm	4.85mm	5.90mm	5.90mm	7.53mm
Jewels	16 or 17	21	21	21	21	21	21,23,25	21,23, 25	25	44
Power Reserve	?	?	42	42	42	42	42	42	42	168
Balance type	?	?	Note A	Note A	Note B	Note B	Note B	Note B	Note B	Note A
Balance spring	flat	flat	Breguet	Breguet	Breguet	Breguet	Breguet	Breguet	Breguet	Breguet
Halfbeats/hour	18,000	18,000	19,800	19,800	19,800	19,800	19,800	19,800	19,800	18,000
Lift angle	?	?	54	54	48	48	48	48	48	41
For Image:		click	click	click	click	click			click
NOTES
A= monometallic, screws
B= monometallic, screws, regulation excenters