The mintage of the Minnesota State Quarter by mint is:
Philadelphia-239,600,000
Denver-248,400,000
San Francisco Proof-3,262,960
San Francisco Silver Proof-1,678,649
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They're many facts about US quarters but ine is that all quarters made before 1965 contain 90% silver.
You think the rarest would be when they made some of the first US quarters in our history.
1964 was the last year US quarters were made of Silver.
No US quarters were made in 1810.
All quarters dated 1964 and before are made of 90% silver, 10% copper