1978 S Kennedy Half Dollars 50¢ (Fifty Cents) Proof
| Sub Type | Coins |
| Country | United States of America |
| Denomination | 50¢ (Fifty Cents) |
| Series | Kennedy Half Dollars |
| Year | 1978 |
| Mint | San Francisco |
| Production Type | Proof |
| Diameter | 30.60 |
| Weight | 11.34 |
| Type | Coins |
| Material | Copper-Nickel clad Copper |
| Mintage | 3,127,781 |
| Currency Amount | 0.50 |
| Year Display | 1978 |
| Height | 0.00 |
| Currency | USD |
| Mint Mark | S |
| Width | 0.00 |