In-Depth: The Patek Philippe Ref. 2497, Part 1: Patek’s Serially Produced First 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. Continue reading ‘In-Depth: The Patek Philippe Ref. 2497, Part 1: Patek’s Serially Produced First Center Seconds Perpetual Calendar’ 0 Posted In: Uncategorized