Patek Philippe

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 co... 

Just grabbed these images of my manual; hopefully they show up correctly (this is my first time using the forum uploading software). ...  

the cal. 27SC (replacement for cal. 12´´´ SC) was introduced in 1949 and produced until 1970. There have been two series, one from 1949 - 1970 and one from 1953 - 1965. They came with 18,000 vibrations per hour and I am not aware of any changes. If we tal... 

I would like to thank you for your help on this Oliver. I had delayed replying as I had hoped others would chime in as well, but alas no luck :( Thanks for your input. I do appreciate it. Best, RT