Pair 1930s Simpson industrial panel meters DC microamps deco cases

Matching pair of 1930s vintage, industrial Simpson electric panel meters. They have art deco bakelite cases and are marked with a US patent number from 1936. These meters are marked for D.C. microamperes and are calibrated on a scale of 0 to 200 micro amps. They measure 2 3/8" square across the meter face.

These are from the estate of an electrical engineer and shortwave radio buff.

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Item No. n83400