Good luck finding decent molds. Most of the original bronze molds are closely held. You can make them yourself with a rubber or even a plaster mold but they will wear out pretty fast. You can also have a rubber mold made for you that lasts for a while or you can have a machinist build you one.
If you really want to get into it, there are desktop milling machines that can mill Al and som can do a 3-D "scan" and then you could modify the design on your computer then cut your own mold.
I looked into this about 2 years ago but didn't go for it. If I see a destop CNC machine on Ebay I may go for it.
IMO, unless you have a new design and plan to make millions of them I would just buy Charlie Graves tins
Good luck.
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