The switch plate in the image looks like it's made from steel with a powder-coated finish for durability. The switch plates for rotary switches were made from raw cast iron and porcelain.
Every single person who ever entered my apartment always asked me about it. It didn't quite fit into my blue-and-white vintage bathroom, though everyone else who entered it was fascinated.
Weatherproof or waterproof switch plates are indeed commonly seen indoors and are typically found in utilitarian spaces, such as basements, entryways, or bathrooms.
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