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Patek Philippe

Question on the cal. 27SC

 

Dear PuristS,

I would like to inquire as to whether there might be 2 versions of the caiber 27SC that anyone is aware of; a low beat 18,000a/h and a higher beat 19,800a/h? I've read 19,800a/h, but I also have a manual in hand that seems to indicate the conflictig 18,000a/h.

Is it possible that there are both variations in existence?

Thank you kindly!

RT

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