In-Depth: The Patek Philippe Ref. 2497, Part 1: Patek's First Serially Produced Center Seconds Perpetual Calendar
- In part one, we cover everything there is to know about the ref. 2497, its dials, cases, and general design history.Quelle: In-Depth: The Patek Philippe Ref. 2497, Part 1: Patek's First Serially Produced Center Seconds Perpetual Calendar
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