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Patek Philippe

Calatrava

 


I am not  knowledgeable on vintage watches, but I am searching for a vintage Calatrava as a gift.  
I found a model 3425 in great condition and it is supposedly waterproof, but i have not been able to find another like it... which makes me wonder if it is truly waterproof? Did Patek ever produce this model as a waterproof watch? Also, it has no markings on the caseback, at least on the exterior. The owner does not have original paperwork, so I do not know the year of the watch. Any ideas? 
Thanks for the help!

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