This is an uncertified 'raw' coin.
1962 Silver Franklin Half Dollar Proof Coin
Designer: John R. Sinnock, the reverse adapted from a design by John Frederick Lewis
Diameter: 30.6 millimeters
Metal content: Silver - 90%, Copper - 10%
Weight: 12.500 grams
Edge: Reeded
Mintmark: None (for Philadelphia) centered above the bell on the reverse
Stock Photo seen here.