Blackened gilding metal jacket?





What vintage are the tinned-case proofs headstamped F A TEST ?


The headstamp F A TEST was first used in January, 1926.
It was originally called the “High Pressure, M1” In Sept.1932, the nomemclature was changed to “High Pressure Test, M1” These cartidges were made through the 1930’s, as needed. FA made 19,800 rounds in 1939.