If you cant get someone who stamps coins in your bay? area, I can help you.
Tho im in the uk and have a fully equipped coin stamping workshop.
I have the 100 ton equipment, as well as a 250 ton hyd press for the
slow minting process.
Feel freecto contact me about sending the blanks to me.
The real question is what dies do you have? I can stamp in a collar if
needed but you have to provide the dies.
Await to hear about these from you as and when.
Goo gold via copper, gilding metal etc.
Best wi from the UK.