Patek Philippe· Switzerland
Perpetual Calendar
Ref. 3940· 1985–present
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Est. Price
Market ~$40,997
The Patek Philippe Ref. 3940 is a landmark perpetual calendar wristwatch introduced in 1985, widely regarded as one of the thinnest automatic QP movements ever made at the time. It features a classic slim case housing the Caliber 240 Q, a micro-rotor…
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