concave flat button

I went back to the 1830s site for a little bit and found a couple more flat buttons. I have never seen a concave flat button and couldn't find any like it in my search. It has the usual markings on the back "Rich Orange Gold Colour". The front is plain.

I went back to the 1830s site for a little bit and found a couple more flat buttons. I have never seen a concave flat button and couldn't find any like it in my search. It has the usual markings on the back "Rich Orange Gold Colour". The front is plain.