Its characteristics (serial number passed to the back of the body and shutter speeds: Z, 1/20s, 1/30s, 1/40s, 1/60s, 1/100s, 1/200s, 1/500s) allowed me to determine that this is a version "d" in the classification used by JL Princelle, made in 1954. Works perfectly. Externally identical to the FED of the same period, apart from the collar around the shutter button (which turns while cocking). Internally the shell of the shutter is different, as amended to be injection molded (since 1951?)