I just bought a old gf250 Hobart welder the serial number is 12cw-66721 specs 5517 ran by a ford 170 motor and I need parts for it and would like to find out what year it is and if it was maybe used in ww2 at all because when I did some googling I seen that Hobart made welder/generators like this for the military so if I could somehow get a manual or anything that would be great.