211: 17 jewels, antimagnetic. Launch Year 1949. But never been opened seal intact. Other data: balance staff: U1565 stem: W1299 mainspring / battery: 1.30 x 5.5 x 0.06mm balance staff ronda: 1841 (5 x 7) stem ronda: 75 (5) Mainspring: 1.300 x 5.500 x 0.070 x 180.000 mm.