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Patek Philippe

I've seen many discontinued references with open papers...

 

... but mostly no name, very seldom no date.

And for more recent models (especially the ones still in production), it is very difficult to find watches in the secondary market with open papers (no name, no date).

If you knew how to look, Patek uses numerical codes to indicate the date of when a Certificate of Origin was printed - not just when the watch was sold.  That needs to be consistent with the date of sale as well as the date of manufacture.  Cross-referencing that to when a watch was in production (assuming it is discontinued) helps root out forged papers.

But if you purchase anything I'd make sure I have someone from Patek or an AD take a second look at the paperwork and the timepiece to make sure everything is OK.  Can't be too careful.

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