The provided context, which includes links to the numismatic pricing guides NGC and Greysheet, does not contain specific valuation figures. Therefore, the following answer is based on established numismatic knowledge regarding the 1966 Kennedy half dollar.
The value of a 1966 fifty-cent coin is primarily determined by two factors: its silver content and its numismatic condition. Unlike coins minted before 1965 (90% silver) or after 1970 (copper-nickel clad), Kennedy half dollars from 1965 to 1970 were produced with a 40% silver composition. This gives every 1966 half dollar an intrinsic bullion value based on the current market price of silver. A circulated specimen, showing signs of wear, will typically be valued at or slightly above this silver melt value, which fluctuates daily but is generally worth several dollars.
For a 1966 half dollar to be worth more than its base silver value, it must be in a higher, uncirculated condition, which commands a numismatic premium. It is important to note that the United States Mint did not issue standard business strike or proof coins for circulation in 1966. Instead, all 1966-dated coins were produced for Special Mint Sets (SMS). These coins have a distinct satiny finish that is different from both standard circulation strikes and mirror-like proof coins.
An average uncirculated example, typically graded around Mint State 63 or 64, may fetch a modest premium above its silver content. However, the value increases significantly for coins in exceptional condition. Specimens graded MS-66 can be worth considerably more, and those achieving the superb gem grades of MS-67 or higher are particularly scarce and sought after by collectors, with values that can extend into the hundreds of dollars. The presence of cameo or deep cameo contrast on SMS coins can further enhance their value. Consequently, the worth of a 1966 fifty-cent piece ranges from its silver content value for worn examples to potentially high figures for pristine, professionally graded specimens.
