This is a motorised potentiometer. The motor runs on 5 .. 12 Volt (40 .. 150 mA). The potmeters are 20k linear. The potmeter connections (low, wiper, high) are 3/2/7 and 4/5/6.
This is a surplus product. It was obtained from a surplus store, from an inventory or from any other secondary source. You can expect this product to be in good working condition, but it can show signs of being handled, shipped, repackaged etc. The supply of a surplus article can suddenly run out, or the price can change. Get it while it is available.