As you can see, it was made by the Nevada City Mint and is pretty hefty, weighing 22.7 g and with a width of 40 mm. Interestingly enough, this custom mint is actually located across the border in California. I believe that they issued a series of these octagonal medals--this one commemorates Sutter's Fort, in Sacramento CA.
Here is the link to the tokencatalog page (#TC-614542):
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