Maс Elroy - semi-automatic key = BUG.

A standard model of 1937 with a black wrinkle base. Mc Elroy explained his exclusion of a chrome - base model in a 1938 flyer as follows: " I know as an operator of 25 years experience that chrome creates light reflections that are a severe strain on an operator's eyes. A few years later Mac did produce the PC-600 with a chrome base.