Rather lovely white metal "silver" object surly this must of been hand crafted by a gold/silver smith? to make a tool to "press" this would of cost the earth
Don't know what age it is it has no hallmark hence me saying "white metal"
It did have a cork insert but no back plate and loop but could be a button or cape fastener or cufflinks would of been made to have been engraved
It the same size as a predecimal 1 penny