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Help Identify Old Hobart

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  • Help Identify Old Hobart

    Can anyone help me identify this old Hobart.
    A previous owner has made a number of modifications, and it looks like ID plate was removed in the process.
    There is a number in the bottom corner of what is left of the wiring diagram inside the welder, it's 12TW-592, but that's likely just the part number for the diagram.
    I'd like to get a manual for this, but without an model and serial number that might be kinda difficult.

    Also, the previous owner wired in a home made foot pedal, but it is kinda suspect. I don't know if a foot pedal was an option on this particuliar machine, but maybe there was a variation of this model that did have a foot pedal. If so can someone tell me what resistance the rheostat had?

    Other pictures are here