REF.3445 is the most unorthodox model vintage Patek Philippe automatic winding model entry model, and with Cal.27-460. CAL.27-460M are thin, Cal.12-600AT, is of a light weight. 19800 Oscillation and bi-directional winding spec is 37 stone, the 5 positions difference adjustment, ジャイロマックステンプ. [M] represents that the date display. Reduced the burdens hung by a thin raised efficiency hoisting 7 bearings due to the thin compared with the movement of the first axis. Compared to current each bridge and beautifully arranged, in polite on the surface, feel the hassle of making things. In one of the premier mechanical movement with automatic winding is counted. 2012 / 07 In メーカーコンプリート have been very recommended.