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Patek Philippe

It is interesting to note the auction catalogue lost essay described this watch as an "unusual and very rare platinum perpetual calendar chronograph" and didn't describe it as a

 

"possibly unique" like they do on many occasions. To date only 1 piece has appeared at auction and this is certainly a special request piece as it was produced in 2006 which was after the official discontinuation of 3970 in 2004

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