Charles,
I wouldn't be at all surprised that it cost around $90K to make this kind of master mold. It is made in two parts, male and female, and is made of highly polished metal to very close tolerances to be able to stamp out the plastic molds at temperatures just below the melting point of the plastic. Pretty precision stuff and expensive. The type of mold I am suggesting is not as precise and would not hold up for mass production but could be used for a limited run before it became useless.
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If it's made after 1918...it's a reproduction
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