Deutsche Mark is guaranteed to be accepted by Deutsche Bundesbank as valid currency at a fixed rate of exchange to Euro (approx. DM2 to €1).
However, no new DMs are issued or printed by Bundesbank, even as replacement for unusable coins or paper currency.
See if you can convert Lira to Euro at that coinmill site; I can’t get it to do so.
Somebody, somewhere, is converting Euro to DM...even if only electronically as a way of “keeping track”...