Wow! With the methodolgy for adding the wood to the handles it's easy to see why plastics took over.
All the originals were stuffed with beech. Or at least every original I ever saw was. Beech can be pressed in 2 rounds.
Unlike ebony, that takes about 5 rounds of press n carve.
In the factory I am sure they already had handle scale blanks made up by the carload. Not like me who has to hunt and scrounge.
I expect they used a hydraulic press instead of my old bench vise screw, to apply the pressure. Probably used a large belt sander with a --long-- belt that cut the wood down very quickly.
It was factory work. Just crank 'em out.
yours Scott