I don't know too much about the Chronomaster Company of Chicago. I rather picture them as one of many companies that briefly turned out clocks in the early to mid 20th century using other's movements. This one is a nice example of 30's eara deco design. The base is very nice, the hands were originally Radium I think (hence the name). A nice example overall, moderately quiet tick and keeps great time.

A very nice alarm clock