[Zeke]

I used to make plugs and molds. Mostly FRP stuff. You say you are hammering 1 mm metal. Is this "mold" actually a buck? What is the final male mold to be made of? If steel, you would have to use a tracer on a multi axis mill. Female to male reverse is possible methinks.

If you are pouring the male just to get a plug and start all over with the molding process, I'd think about the reverse duplicator. I watched a program last night about striking coins. The reducing duplicator is a neat machine.