The Venetian Grosso
had been copied by several Eastern
Christian kingdoms. However, there are several distinguishing features that can tell them apart. Apart from the legends indicating the ruler, the main features that can be used to identify these coins is the 3 letters next to the banner. The Venetian Grosso has DVX next to the banner indicating dūx or Doge. Here is a Venetian Grosso of Giovanni Dandolo (1328-1339):
The
Bulgarian Grosh
had either IPR (for emperor) or
CAR (for tsar). Consider the
Bulgarian Grosh of Mihail Assen III Šiš
man (1323-1330):
Finally, the Serbian Dinar
had REX for
King as in the following coin of
Stefan Uros II Milutin (1282-1321):
So based on the above, the coin to the right is a Venetian Grosso, but the image is too small for me to determine the Doge. As for the coin on the left, it also looks like a Venetian Grosso, but I can't tell because it is too small and I am having a hard time reading the 3 letters. You can use the information above to determine what it says. The middle coin is a
Bulgarian Half Groší of Ivan Šiš
man (1371–1395):