US Navy Submarine Dolphins by Meyer

In an excellent condition a clutchback Submarine Dolphins by Meyer Vietnam era On the back marked 1/20 silver filled, a raised Shield and the maker N.S. Meyer New York 1/2 Silver filled was used for military badges on and after 1968 and changed again during the Vietnam war towards plated badges and stopped completly with silver filled altogether by 1974. It is therefor safe to say the badge is handed out during the Vietnam era