Identify postage stamps

Hello. Identify postage stamps. I ran into me again with an unknown postage stamp. Can you help me identify it and evaluate it?

I'd rather know what kind of coins are on them?

Here
The first stamp : 1285 venetian ducat
The second stamp: Genoan genovino and Florentine florint

That's very interesting. I honestly don't know much about Venice and Genoa. But I've always admired their culture and importance in Italian history, and in all Civilizations. Thank you for helping me. I found this postage stamp in the catalogue, too. But I was still more interested in the coins. Thank you for your help.