I can't imagine what CSM stands for, but they were one of the many companies that produced decorative chalkware "radio lamps" in the '30s-'40s.

CSM TV Lamp value:  rarity:
Stylistically similar to many ceramic TV lamps to come, CSM's ship is detailed and nicely colored. Photos courtesy of James and Claudia from Mount Vernon, Ohio.
CSM TV Lamp Back view.
CSM TV Lamp I believe this bulb is as old as the lamp!
CSM TV Lamp It is marked on the back, © CSM 1935.

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