ALPS Balance potentiometer, 2 x 10k.

RK40 metal bodied 'Black Beauty' in excellent condition (DMM tested).

Centre detent, of course.

Acquired many years ago (heavily into pre-amps at that time) but never got round to using it.

Solder on pins and tiny burn marks adjacent pins 3 (result of contact with soldering iron obviously) 

testify to previous use - however, that use must have been exceedingly light, because...... 

The action is very smooth and evenly 'resistive' during full rotation both ways.  

Large! Body is 40mm wide x 35mm high x 30mm deep. 

           6mm dia shaft.

           Overall depth (body + shaft) 55mm.