German military guns's mags were probably marked from the beginning in 1908. Commercial mags were not.
No way to tell year made beyond what a serial number and suffix would give away for when made. IIRC, Erefurt and DWM mags have distinctive crimps/follower stops at the top.
One would strive first for "period correct," then come as close as possible in number within a production block of the same suffix letter.
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