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1944: Patek Philippe Ref. 1591, first Water Resistant Perpetual Calendar Wristwatch - Revolution Watch
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Review – The Patek Philippe 5320g Perpetual Calendar, and The Inspirations Behind This Vintage-Inspired Piece - WATCHLOUNGE
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Patek Philippe. An extremely important and unique stainless steel water-resistant perpetual calendar wristwatch with indirect sweep centre seconds, phases of the moon and luminous indexes
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