Question about the US Mint

i saw a coin that was made to honor this particular family. it had the family crest, etc. it was 250 grains of silver. (i know that is little more than 1/2 oz) My question is how do they get the mint to issue that and what do they charge for that service? this was done approximately 40 yrs. ago. thanks everybody for your help. it ws a beautiful coin.
eddye
eddye
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