Forum O. G.
I bought my dual-height one in Woolworths in 1981 - I wheeled it home on the pedal of the bike.One of the best bits of kit ever invented the Workmate.
That and the hammer.
@Toble has been looking after it for me for a few years now.
It was designed by an interesting character - https://en.wikipedia.org/wiki/Ron_Hickman
I have a couple of the much rarer "Jobber" variants, probably even more useful - they can be clamped onto just about any table/counter/desk/surface, or just used 'loose'.