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Heuer 1133 cal. 11 stamp on the back *PIC*

Hi all,

I'm a happy owner of a beautiful 1133B Steve McQueen Heuer vintage watch. The watch is in pretty good shape, but there's something that called my attention: one the caseback there's a "cal. 11" stamp. Thats something I've never ssen before and I know that's not production mark. So can anyone help me to fiand out what could be behind this?

https://www.dropbox.com/s/2xfgoa5x4joagki/IMG_20140829_153343.jpg

Thanks for any peace of advise!

Cheers

Michael

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