I'm not sure what the best source for this information might be, but it is often repeated that the "C" on the case-back followed by a series of numbers means that the watch was originally sold into the Swiss market.

I'm not sure why this was done; perhaps the "C" represents the "CH".

Jeff

+++++++++++++++++++++

: I just spotted this in the trader section, the seller surmising
: that it could be because it was sold in Switzerland. I have a
: 11630 GMT with very similar markings (starting with C too)
: I'm sure this was mentioned on here before, but I can't really
: remember the outcome.

: Does anyone know what they are/mean?

: This is the Autavia in the sales section:
: http://www.chronocentric.com/forums/chronotrader/index.cgi?page=1;md=read;id=21089
: Below is a pic (I hope the owner doesn't mind me using this pic)...

:
:

: Thanks
: Stewart