Has the air of being some sort of science / metrology lab kit rather than machine tool. If its made from brass / yellow metal its almost certainly ex lab kit.
What is the thread on the top? – if 1/4 Whit it could be some form of adjustable camera mount
That was my first thought. My father was a keen radio amateur, and in the early 50's he was advising a friend of his who dealt in ex WD equipment. It was a boys delight to look his yard, from memory most of it was of high quality, and probably over engineered.