Lot of assorted vintage AC/DC electrical panel meters from makers stash

Lot of four assorted vintage electrical panel meters from the estate of a electrical engineer and DIY buff / maker. There are:

A Simpson DC micro amp meter with a range of 0 to 50. It measures about 4.625" x 4".

A Simpson AC ammeter 0 to 1.0 amps. It measures 3.25" square.

A Triplet model 327-PL meter for D.C. millivolts with a scale of 0 to 100. It measures 3.5" x 3". This meter carries a US patent number from 1944.

and a General Electric D.C. milliamp meter with a scale of 0 to 50. It measures 3.5" square.

These all have some wear and look to have been recycled from other projects and saved to be repurposed into something else.