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For Diamond Series instruments, it's simple: The first two numerical digits of the serial number (found on the back of the headstock) will tell you what year the instrument was made. For example, for serial number 0236758, the '02' indicates that the guitar was made in 2002; for serial number W10052743, the '10' indicates that the guitar was made in 2010.
Schecter began as a parts manufacturer and eventually began making their own complete guitars, so from the late 70s to around 1998, when the Diamond Series was introduced there are a lot of guitars that don't follow the first two digits rule. For those you can try contacting Schecter from this page:
http://www.schecterguitars.com/about
Elle daterai donc de 2012 !?