Patek philippe 'Ref 3445' wristwatch, the gentleman's 18ct gold automatic wristwatch with silvered dial, applied gold batons, dated at three and subsidiary seconds dial, dial signed Patek Philippe GenĀ¦ve, reference 3445, movement number 1.125.607, case number 322.351, calibre 27-460M, on a later 18ct gold bracelet. Accompanied by extract from the archives. Ref.3445, frequently referred to as the 'Monodate', was the first calendar wristwatch produced by the Company in series.