3 Mark - William II

The X# prefix places this in Krause's Unusual World Coins catalog — meaning this is not a standard circulation strike but a restrike, pattern, or officially sanctioned copy produced after the fact. The X#3c designation specifically identifies a silver-plated copper specimen, almost certainly a later restrike made for the collector market rather than anything that passed through Prussian commerce in 1913.

Treat the stated year with skepticism. Restrikes of Wilhelmine-era pieces were produced decades after the originals, with 1913 functioning as a commemorative date rather than a production date.