Rare effect by Johnson Magic
 
Ultimate Expanded Shell - 1964 Silver Kennedy Half Dollar
 
Johnson Precision Magic was a U.S. company known for making high-quality coin magic gimmicks using precision machining. From roughly the 1960s through the early 2000s, they produced reliable coin gaffs and brass props that became standard tools for magicians. After production stopped, their items became collectible and are still valued for their craftsmanship and durability.
 
CONDITION NOTES:  Coin is in very good condition with typical wear for its age