Product information is limited on this one i'm afraid, these came to us as part of a job lot of surplus stock from a Milspec type OEM without any information. They are obviously made to a high specification the potentiometer itself (value unknown) is enclosed in a solid cast aluminium case with a professional collet knob attached to the shaft, the knob turns through approximately 340' and the scale is marked RF gain with AGC at the start and 0 to MAX. At the other end 3 connection wires (approx 80mm long) are terminated with 3 gold plated pins in a plastic housing.