I've had this for about 17 years. Found it in the rafters of a garage we tore town on my grandpa's farm. He had moved the building in to the farm in the late 1960's. Tag says Mack Products Co. Winthrop, Mass dated 9-42. The chrome is pitted with some surface rusting. One of the control arms and two alligator clips on the wires are missing but the rubber boots are all there as well as the original cloth wire. I have the cylinder peg that is missing. Ideas on value?

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David Stewart- Standard Oil (Indiana)
Re-creating the Humboldt Standard Station
George "Ben" Matthews 1931-1944
Roy J "Elmer" Maxwell 1944-1972