Recent research into the originals of the Picador Company - well known at one time for their inexpensive plumber blocks, speed shafts and very simple wood-turning lathes - has uncovered the fact that some models of the latter carried patent numbers that belonged to a Herbert Kohn Staub. The earlier background to, and history of, the Picador Company is shrouded in mystery with the only information initially available showing that it was founded in London in the 1920's and a competitor with Draper Tools, another maker of generally lower-cost items. The company relocated to Birmingham in the 1940's or early 1950s and was then was bought by what appears to have been a private individual (the writer recalls having some contact with him) and relocated to Scunthorpe.
Hence, we now know that the drill was made in England, Mr. Staub being the owner of the Picador Company with many of his 15 patents, taken out in the 1950s and 1960s, relating to Picador items. Items he registered included measuring rules, plummer blocks (an item so typical of Picador), ways of mounting self-aligning and adjustable bearings, spanner keys, improvements to bearings, improvements to hand tools, hand tool handles,  improvements to pivotal supports, belt-tensioning devices and machinery mountings, improvements in grooved pulleys for use with V-section belts, and improved base frame for motors and other machines (another typical Picador product), and an improved bracket for mounting plummer blocks. Some of his patent drawings are shown of the Picador page.
Another Picador tool bearing SHK badging - and so presumably also designed by Straub - was the 4-inch "Rotosaw", a picture of its maker's plate is at the bottom of the page.
My thanks to Gavin Redshaw for his help in ongoing research into this matter.A robust little bench drill, the SHK or HKS, constructed, economically, from a particularly robust casting with  an integral foot. It was driven originally - like so many of its kind -  by a round "gut" rope passing upwards from a motor mounted behind the main column and passing over a pair of jockey pulleys. The 3-step pulley was fixed in position and the quill arranged to slide through it, a light coil spring wrapped around it providing some extra  "feel" to the action. The first example of the drill illustrated below has been converted to a more traditional system with its motor bolted to the back of the column - though there is no reason that the makers could not,, with a little imagination, have used something more like that on the rather lovely WA-CO
In place of a rack-and-pinion drive, the makers economised by arranging for the quill to be moved by a simple double-cam mechanism, one cam to lift, the other to lower.
Able to be raised on its round post (the length of which appears to be rather short) the table might have been made in two version, one as a semi-circle, the other square--though this type might well have been an owner's modification).
Why two holes are provided at the back of the column to carry the jockey pulley shaft is not known, though possibly an alternative drive system was offered - or the pattern maker decided it just looked better that way.
Other simple, lightweight drill presses in addition to the WA-CO include the Cameron, Baby Grand, Champion, Baldwin, Dixi, Dumore, Hamilton, Hauser, IME, Meepos, Micromeccanica,  Oldak and Apex, Paco, Progress No.10, Ruka, Schaublin and WA-CO..