These came from the estate of a US Naval officer who served in the Pacific in WW2. Well-marked as Imperial Japanese Navy Property. One measures micro-amps, and the other measures voltage up to 25 Volts. I believe that the electrical system in Japanese planes at the time used 24 Volts, so this would be compatible with use on aircraft, but I don't really know the story.

I've seen these gauges listed for sale at $150-$250 apiece, but as a kind of social experiment, am offering the pair for a fraction of the supposed "goes for" price to stir up interest.