Quote: "Jarcek"So, this would be a time after Empire fell and before Ottoman conquest, right?
Well... kind of?
(Note: the below information is mostly from Wikipedia.)
When the Serbian Empire fell, it fragmented into multiple states, not all of them in what we would call Serbia today (though some of them were).
Probably the largest and most significant of them was the so-called
Moravian Serbia; there is
one coin from that place (without pictures, alas) listed on Numista (again under Kingdom of Serbia).
Eventually, in 1402, the ruler of Moravian Serbia obtained the title of "despot" from the Byzantines; this would normally signify a vassal relationship, but in 1402 the remnant Byzantine Empire was too weak to confer any actual vassalship, and Moravian Serbia had already been a vassal of the Ottomans since 1390 anyway, so the ruler in question,
Stefan Lazarević, decided that "despot" was their new monarchical title, and declared the
Serbian Despotate.
Still an Ottoman vassal, also a Byzantine vassal (until 1453, when that empire ceased to exist - and yes, this meant they had to help
both sides in the Ottoman conquest of Byzantium), and since 1404 also a Hungarian vassal, the Serbian Despotate held on until 1459 (with a brief interruption in 1442-4), and kind of survived further as a government in exile in Hungary until at least 1537 (though I do not believe that any of its exiled rulers issued any coins).