Clayton Mayers were always looking for ways to keep the price down and at the start of the war they turned to making machine-made Jacobean glassware.
Asking for a time out here....
definitions are not clear....
So define what we understand/they meant by machine-made....
The changes in the Czech industry of the period, was between presses such as the manual Kutzer press in use since 1909 or earlier, to hydraulic presses, which occurred @ 40-50 years later...
Automatic lines appeared in the mid-1950s.
Definitions, and accuracy is essential to our understanding, and this requires that we cannot assume automatic or semi-automatic production lines, came into use, and I remain to be convinced that this change came in the early years of WWII. I would be surprised if major new technological developments for the production of domestic/utility glass would have been allowed, when military production was given precedence.
Regards,
Marcus