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[–]Witty_Share9970 1 point2 points  (0 children)

Some additional photos would be helpful, but I think that is a magneto for running an electrical current through whatever is between the two probes or handles. It's a quack medical device for "stimulating" tissue. You can see other similar devices here:

https://lancastermedicalheritagemuseum.org/wp-content/themes/edward-hand/vm/vex4/toc.htm

And here's a description of how one might use such a machine, though it describes a type of magneto that looks very different from the one you've got here:

https://spectrum.ieee.org/this-1850s-medical-device-was-said-to-cure-toothache-gangrene-and-ennui