Can anyone tell me any info on a Sureweld A-C Arc Welder. Made by National Cylinder Gas Company in Chicago Ill.

Serial # 62-1037 or 62-1D37
Model # 20G

The only thing that I've found is that it is of WWII era and that Miller and Hobart had contracts to build them for NCGC about that time. It's an antique and I'd like to know the year and some history.

Miller doesn't show anything under there serial number chart and Hobart shows nothing either.