Original U.S. WWII Manhattan Project A Bomb Workers Sterling Silver Pin British Machine Guns a modified version known as

a modified version known as the M1A1 was adopted

Each company painted their respective letter inside the shape

at least partially due to the expense to the state of maintaining horses

halftrack or other vehicle

Original U.S. WWII Manhattan Project A Bomb Workers Sterling Silver Pin British Machine Guns a modified version known asOriginal item: Only One Available. This is a genuine sterling silver MANHATTAN PROJECT pin that was given to the workers who spent for more than one year on the project. The pin is polished and in excellent condition with working pin and catch. It is nicely marked on the reverse with maker Whitehead Hoag and Sterling. Pin measures 11 16 inch round. The Manhattan Project was a research and development undertaking during World War II that produced the