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Patek Philippe

Patek strap letters (A91 vs C34)..?

 

Anyone understand the system for these indications? Obviously there’s the large engraved B or D for buckle or deployant. But what do secondary *printed* letter 2numbers combos mean?

I thought maybe matte vs shiny or thick vs skinny but by looking at the numerous I have of all letter and number convos that doesn’t seem to hold up at all

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