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The ref. 2497 was Patek's first serially produced central-seconds perpetual calendar. Frankly it's an link oddball design and dare I say it not my favorite Patek perpetual calendar. It's funny now in hindsight that I spent so much time link on this article which all started because of one simple question for which there was no easy answer available online. But even I'll admit there's something to like about the reference. Any major Patek "first" is worth at least a closer look. link
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