If you do some deep digging, you'll find the aforementioned ref. 2498 in the annals of the Patek Philippe book
link by Huber and Banberry,
link but the watch shown in the book doesn't seem to match Christie's description of the 2498. Theoretically, this could be the most important ref. 2497 (even if it's a 2498) because, as described, it would be both unique and the
link purest transitional reference between the 1526 and the 2497.
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