Hi Mike.
Not sure if either of these will help, but a quick check of my references show the following:
LO 5-5457 (Date unknown) Welders, Electric arc, Hobart: GR-300-S
TM 5-3431-202-20 (23 Oct 62) Welding machine arc: generator; gasoline driven; single operator; remote control; 300 amp dc; Hobart model GHB3183S
David
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