NuTone K32 Continetal 1948
The cover is made of styrene plastic, although there are some examples with a pressed steel cover.
This example is of later manufacture as it employs the double acting solenoid patented in 1953.
Coincidental to the post-war building boom, NuTone had expanded into other product lines, with one of the first being ventilating fans. The K32 Continental was marketed side-by-side with a new kitchen fan.
Advertising warned customers of the dual perils of “noisy bells and kitchen smells…because nobody likes the ear-splitting noise of old-fashioned doorbells—or the irritating smell of kitchen odors.” Apparently, smoke from tobacco pipes was not yet on the public enemy list.