Ah, forgot, as for the names, we used to say the name of the painted person in the money, 500 were Skanderbeg and so on.

While in Italy where I live, in Rome the jargon is:

Sacco (bag) - means one of thousand (1 in euro, 1000 in the old lira)
Scudo (shield) - 5 or 5000 euro / lira
Piotta (can't translate in English) - 100 € or 100,000 lire