Patek Philippe Caliber Numbers
The letters in Patek Philippe caliber numbers signify the complications and functions of the movement.
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Patek Philippe Metal Codes
The letters in Patek Philippe reference numbers and movement codes are abbreviations of French words.
Patek Philippe Serial Numbers with Production Dates
The serial number on a Patek Philippe watch can be found in different places, but it is always engraved somewhere on the case back. If it has a see-through case…