Ron Guth:
In 1875, the San Francisco Mint made twice as many Half Dollars as the Carson City Mint, but just over half as many as the Philadelphia Mint. With a mintage of 3,200,000 coins, the 1875-S Half Dollar is valued as a regular example of the type, with no premiums for most grades. Mint State examples are plentiful in all grades from MS62 to MS66, above which this date becomes an extreme, condition-rarity. The strike quality on 1875-S Half Dollars varies from soft to strong on the stars. Thus, if given the opportunity, and all else is equal, choose the coin that is better-struck.