Searching my 1953 Buck & Hickman I found a picture of some pliers (Fig 2116 page 185) looking just like those in David's pictures.
The item is called Quick-Grip Pliers
" A handy tool for the motorist, cyclist, engineer, plumber, gasfitter, electric light fitter, watchmaker and every trade where nuts are used. Self adjusting."
Two sixes 6" priced at 2/7 and 7" priced at 2/10
Must be about the most universal tool ever made !
Eric