This is a rather unique and large Chinese Silver Button...finely Hand Crafted, in the form of an ancient Chinese Coin/Money.
This Button was wonderfully crafted, with a textured background, applied detailed Border and center Hole Border. It features four character marks as the central décor. The reverse has 2 hand applied Loops for attachment, and a very partial Chinese Hallmark.
It is a very large size - approx. 1.5" or 38mm...typical of the Fantasy Button sizes during the mid to late 19th Century....Of very high quality compared to later buttons, and most likely of .925-.950 Silver.
An unusual fine Button for your collection.....