Very nice! Almost looks like something might have gone in the middle of it This is a first for me, never seen a pewter button - the design is really cool.
Cool looking,(looks small) will have to see when you get the back cleaned up around the shank.Reminds me of a cuff link button I found (that was pewter I've since urethaned)but mine had a drilled eye shank & the large copper connect link you would normally see on cuff links.
Take Care,
Pete,