Simple universal round buttons common in more eras. These are inspired by excavated pieces from London (Egan and Pritchard 1991).
diameter of the loop outside/inside 5/2
weight app. 3,4g
It is possible to order silver or golden plated version. The delivery time is usually 1 month maximum. The price is usually 1,5 times the original price for silver and 2 times for gold.