Lots of great advise and suggestions. So, went out and scraped some out into one of the Mrs good spoons. The material melted quite quickly, turning darker as it did and seemed a little sticky. Once it cooled it was pretty crystallized and hard. I explored several other areas along the rib and gently scraped with a scalpel tip. It is definitely silver underneath. I rang the barrels again and compared them to an older 101 I have. The sxs barrels are quite noticeably higher in pitch. The vibration was very similar on both, really could not tell a difference in the feel. This is a mid 50's gun so practically new compared to my usual stuff. It either hasn't been used much or someone spent a bunch of money on refinishing it.
