Longines 25.173

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Serial no: 5 454 511 (aprox: 1938). Flat hairspring. Data: Longines 25.173 15 jewels, manual winding. indirect sub second. Size: 8 x 11.5''' 17.8 x 26.55 mm. H: = 4.0 mm. N: = 18.0 00 A/h. Power reserve: 43 h. Mainsping: 1.60 x 10.0 x 0.10 x 360 mm. Versions: 25.17, 9L: Bimetallic balance, Breguet hairspring. 25.173: Monometallic balance, flat hairspring. 25.17ABC, 9LT: Monometallic balance, flat hairspring. Show more