So I got the Beretta 84 in a trade. Don't know too much about it so looking for words from the wise. It's a made in Italy gun, marking says P.B.- Mod 84...that's it, not 84f, 84b, 84fs, etc. it's a 13rounder in .380. I looked the serial number up on Beretta website and it's not listed, what does that even mean lol? What can I expect to get on a resale or trade value?