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 Fig. 1  Fig. 2 | Landeron 51 Features manual-wind chronograph, 60s, 30/45min, cam switched sub second Data 13.75''', Dm= 31.0mm, Do= 31.5mm H= 6.2mm F= 0.6mm T= 1.6mm 17 jewels f = 18000 A/h power reserve 41h Balance staff U1457 / U3137 balance with/without screws Stem W1158 Mainspring / battery Zf978, 1.35 x 12.0 x 0.14 x 360mm Hands 1.85 x 1.30 x 0.25 / 0.27 x 0.20mm Comments about the data | Remarks 1937-1970, >3.500.000 (all derivatives based on Landeron 48) There were various chrono mechanisms. And as their parts often were interchangable, occasionally series were produced with parts of different calibres. minor differences between 51, 151, modified parts interchangable family: 51, 151: 13.75''' 55: 14''' 57: 14''', calendar 59: 13.75''', calendar 80, 180: 13.75''', calendar, new pusher layout 81, 181: 13.75''', calendar, moon phase 82: 13.75''', date at 6h 159: 13.75''', date hand at 6h Example, year: signature; shock device ca. 1945: SXK, Bovet Freres & Co SA, Swiss, 17 Jewels 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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