Here are images of what is suggested to be a Venice Ducat from approximately 1460. Note the COA from Calhous Collector Society. Any help further identifying this coin would be appreciated!!
It looks generally consistent with a medieval Venetian ducat. As to attribution, I'm afraid I'm not specialized enough to help you. Authenticity? I don't see any obvious red flags.
I recognize you from the PCGS forums. Send it off to them, and you'll have that final bit of security, a slab and a TrueView image, and maybe an attribution as well. (A Friedberg catalog number, I would expect. They put one on my 12th century tari, though I did not provide or even know that information.)
None of us on either forum have been able to identify the Doge who issued this coin because the name (to the right of the flag on the obverse) is worn away.
I'd definitely send it in as it just looks a bit "off" to me. I collected these a bit and with a good deal of effort I could usually attribute them correctly. But I no longer have all the books I'd need to do that. Striking variations are well known of course as they were minted for 750 years, but, they all have very similar looks. And this one is just one I don't recognize, could be I've just never seen one like before. That said, it may well be perfectly genuine, but like I said it just looks a bit "off".