For sale is a small panel mount meter from the Weston company, model 1011.  This version has scale markings 0 to 10 with a red band in the center corresponding to 5 +/- 0.5.  It inserts into a round hole in the panel and then secures to the panel using 4 mounting holes. This was the adjustment meter out of a Collins 18S-4 military aircraft transceiver from the 1950s.  Because it measured multiple things in the unit (selected by switch) a 0-10 scale was used.  

The meter works well and is full scale at 2 mA DC.  Two of the pictures show the meter working at half and full scale current (1 mA, 2 mA, monitored by a multi-meter). This would be an interesting thing to design into a home project.

Dimensions:

  Front:  1 3/4" square

  Panel hole 1.5"

  Depth front to screw terminal end:  1 5/8"

Condition:

-- The front plastic piece has some scuffing that can't be felt but can be seen in the right light.

-- Some black paint has chipped off of the brass backing plate and scuffs in the black painted cylinder at the back of the meter.