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 Fig. 1  Fig. 2 | IWC 74 Features stem wind and set sub second Data 17''', Dm= 37.4mm, Do= 38.0mm H= 4.2mm F= 0.5mm T= 1.5mm 16 jewels f = 18000 A/h power reserve 30h Balance staff U155 Stem W1477 Mainspring / battery 1.20 x 15.0 x 0.20mm Hands 1.65 x 0.90 / 0.15mm Comments about the data | Remarks 1913-1931, ~15000 hunter calibre bimetallic screw balance with 4 adjustment screws Breguet hairspring patented big bearings for crown- and ratchet wheel barrel with Geneva stopwork details cf. IWC 52 19'''H5 Swiss Patent 31457: filed 05-11-1904, Fabrique d'Horlogerie de J. Rauschenbach (CH) crown- and ratchet wheel with top- and bottom part, kept together with three screws each Swiss Patent 55231: filed 03-28-1911, Uhrenfabrik von J. Rauschenbach (CH) dial fitting after push-button principle family/generations: 73: open face calibre 74: hunter calibre 77: open face calibre, covered winding gear suffix A: details unknown Example, year: signature; shock device 1926: 840266, IWC Probus Scafusia - IWC Probus Scafusia, +31457, +55231 Not for Sale! The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating. |
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