IWC's Calibre 4xx Series Wristwatch Movements
IWC caliber Type Seconds Date Jewels Rotor Rotor Impulse vph -mm -lignes ht.-mm
            Bearing Angle        
41 manual none none 17 none none 57 19,800 13,5 x 17,3 6 x 7 3,40
40 and 401 manual center none 17 none none 50 19,800 23,4 10 3,65
402 manual center none 17 none none 50 19,800 23,4 10 3,20
403 manual center none 19 none none 50 19,800 23,4 10 3,15
412 manual none none 17 none none 57 21,600 13,5 x 17,3 6 x 7 3,50
42 and 421 manual ? none 17 none none 50 19,800 23,4 10 3,70
422 manual none or at 6 none 17 none none 50 19,800 23,4 10 3,15
423 manual none none 19 none none 50 19,800 23,4 10 3,15
431 manual none none 17 none none ? 19,800 11,5 x 15 4 x 6 3,25
432 manual none none 17 none none ? 21,600 11,5 x 15 4 x 6 3,30
44 automatic none none 21 heavy metal ? ? 19,800 17,6 7 4,80
442 automatic none none 23 heavy metal pin ? 21,600 17,6 7 4,80
480 automatic center at 3 25 heavy metal ball 53 28,800 17,2 7 4,80
Continued
IWC caliber
  Balance Produced Total
  Spring  
     
41 Flat 1949-1970 108,000 Succeeded by Cal. 412
40 and 401 Breguet 1952-1965 26,400 Succeeded by Cal. 402 NOTE: This chart is copyrighted 2002 and may be
402 Breguet 1966-1969 16,800 reproduced, or linked to another Internet site,
403 Breguet 1966-1969 ? only with advance written permission.
412 Flat 1972-1992 39,600
42 and 421 Breguet 1952-1963 1,800 Succeeded by. Cal. 422 The information herein is based on best
422 Breguet 1966-1969 2,400 available sources, but certain data, including
423 Flat 1972-1976 9,500 production years and totals, are tentative
431 Flat 1954-1976 51,600 Succeeded by Cal. 432 and subject to correction.
432 Flat 1972-1973 ?
44 Flat 1959-1970 9,000 Succeeded by Cal. 442 Michael R. Friedberg
442 Flat 1972-1974 24,000
480 Flat 1983-? ?