Pair of deco vintage industrial electrical panel meters for DC amps

Pair of vintage industrial Simpson electric panel meters. These meters both measure about 4 5/8" x 4 1/2" with black bakelite deco cases. These panel meters are marked for measuring DC amperes. One has a scale of 0 to 50 and the other has a scale of 0 to 75.

These are from the estate of an electrical engineer and have no cracks or chips to the bakelite. The meter with the 0 to 50 amp scale is missing a (calibration?) screw in the front. We're selling these meters for repair or parts.