Patek Philippe

Stamps/Hallmarks of PP watch cases....

 

Hi all,
in a recent post here: watchprosite.com  
Steve asked for the different hallmarks in the lugs of his ref. 5107. Here's a short explanation of the four different hallmarks usually found stamped into the underside of the lugs.

The only easily readable of the four are the oval "PPCo" and the "750" . The other two are the swiss national hallmark for precious metals, the St. Bernard dog's head and the "common" hallmark with a scale and the purity (in parts of thousands). That's a complete list of the four hallmarks:



The "common" hallmark with the scale and degree of purity is used as sort of internnationally accepted hallmark for precious metals, to my knowledge it's accepted by those states who signed the Vienna Convention and the "EFTA" countries as well.

The "PPCo" is called the "responsability" hallmark - swiss law requires all preciosu metall goods to be marked with the manufacturer - as to be able identify the source and the "responsible" who made it and eventually also keep track of the amount of materials and purity used. Some of these responsability hallmarks are so called "common" - i.e. the same hallmark could be present on finished products of different manufacturers, but using the same case maker (just as an example). The commonly seen "hammer head" case maker hallmarks would be an example for such common hallmarks.

Hope this helps
Best regards
Suitbert

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