1974 Eisenhower Proof Grade Question

All of the silver "Ike" coins were minted at the San Francisco Mint in 1971, 1972, 1973, 1974, and 1976. These coins were either uncirculated or proof. Uncirculated coins came in cellophane with a blue plastic token in a blue envelope. Proof issues came in a proof set-like plastic case in a fancy brown wood colored box with a gold seal on back. The uncirculated coins are referred to as 'Blue Ikes' and the proofs as 'Brown Ikes'. Coins minted in 1975 and 1976 for the Bicentennial come with the quarter and the half dollar of that year. The uncirculated coins were sold by the Mint for three dollars; the proof version for ten dollars. Two varieties of the dollar were produced in 1976 and can be distinguished by the thickness of the lettering.
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