My G23 has no rail or grooves and the serial number starts ADY. I know there are sites available where you can ask. But I like this site... So what is the format???
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You sure it's ADY and not DAY? I can't find ADY, but DAY is March 1999.
Well I found this - http://glocktalk.com/forums/showthread.php?t=1287557 - and while your ADY isn't specifically mentioned, it looks like the three letter AD serial numbers are from 1992.