On many silver coins historically used in China there are specific marks stamped into them. These marks come in various shapes and sizes. A study is being made on this by a dedicated society.
In the great subcontinent hand struck coins, in general silver rupees, also have a series of marks impressed on them. These can occur on the obverse, reverse and rim.
Data is to be collected from photographs of these coins so that a comprehensive data base can be built up for research purposes.
The full research team and details will be advised soon.
The obverse and reverse of a rupee showing various styles of chopmarks. The round punch mark on the lower coin appears to a "shroff" test mark to ascertain metal type and purity.