Mike,
Here's some interior pictures of mine. I'm hoping to narrow down the date better with some information from somebody on the Hobart Welders sponsored Weldtalk forum. But I think it's very late 1945. Then sometime after the electrically controlled governor was installed replacing the purely mechanical one. It's not original to any WW2 ones I've seen but it does show up in later 40's welders. That's the box directly below the engine control panel with the wires coming out of it. You'll note I have the engine speed knob in the center of the engine control panel. But no linkage over to the governor. That is all missing.
Matt
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