Ornate pewter flask

I found this item at Goodwill and I can't find any info on it. I'm pretty sure it's pewter. It's very heavy at least a pund and a half. There is what looks like an art catalog number on a sticker on the bottom of it. Made in Italy is stamped on the bottom as well. It has AP  and 1647 stamped on one side and ornate flowers and two rings on the other. It has a screw on cap that in my opinion does not look machine made. There is a flower stamped on the bottom side that looks like it has been tapped inot the surface and G-B on the other side that looks tapped as well. Any information would really be appreciated.