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It's on record that the San fransisco mint had a set of 6 die set,that means the die would stamp 6 coins at once.
Doodatt, Where did you get this information? It sounds like what you have read somewhere is that the SF Mint received 6 die marriages, which means that they received 6 obverse dies and 6 reverse dies for use in 1870. It has nothing to do with how many coins can be pressed at a single instance.