Aha! Not the strange stand but my eye was also caught by that tailstock chuck….
I have a couple of what look the same type, with a (Jacobs???) female taper instead of a Morse taper shank. What I take to be the trade-mark rather weakly stamped on the specimen immediately to hand is “Crown”, below a faint, stylised image of the head-gear.
The jaws are not cone segments but consist of two sets of interleaved plates with a Vee-notch in each so they enclose a square.
Are these drill-chucks or tap-holders? Or both?