For your consideration;
A vintage Elliot Brothers oak cased micro amp meter/ammeter, circuit tester.
This one does go up to 600A but does state on the dial to use a shunt for that level of voltage.
The needle is bent at the middle however does seem to move freely, untested but all does look present.
Please inspect photographs for full condition, beautiful oak case and strong handle.
Height 19cm, length 19cm, depth 10cm.