Needing to identify possible war button

by rdg15

Found while visiting Suomenlinna , a military fort in Finland. Has a stub on the back which looks as if it was part of a button, along with leaf surrounding the edge and some writing. Have currently identified it as possibly the coat of arms of Novgorod. Any one have more information on it?

Pictures

Searocksandtrees

Hi OP, can you edit your post to provide a new link to your picture? Currently it links to your other deleted post, but when a Reddit post gets deleted, the post text is replaced by [removed]. Thanks.