These are Simpson
DC Current Meter
(marked in DC Millamperes 0 to 50mA)

Meter Face: 4 inch wide x 2.70 inch tall
Panel thickness: 0.56 inch
Body depth (behind panel): 1.25 inch
Mounting stud length:0.53 inch
Overall depth with terminal posts: 1.75 inch

These are factory new parts. They have never been installed and have not been recovered from manufactured electronic components.