I have this coin that looks like Unger #379 or Huszár #481 so the legend should be + KAROLVS REX hVNGARIE but I see a clear M. on the legend.
Size: 11.3 mm, Weight: 0.3 g
This coin was found in a thesaurus with other Károly Róbert coins, actually almost all other coins have the expected legend, like the picture below.
In the same thesaurus I have another strange legend.
Size: 12-13 mm, Weight: 0.3 g
I found nothing in Unger or Huszar like this. Thoughts on this?