Pot metal HURST shift levers???

Looks like it failed at the bend. I'd guess it cracked on the initial bend. In your picture of the broken end, (unless this is an optical conclusion by me) I see dark area and a much smaller lighter area. It was probably just hanging on by that lighter area when it came off. I'm sure it's heat-treated steel though. There's possibility of de-carb that might make that area more brittle but unlikely.
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Hurst Shifter Rebuild, Replacement and Service Parts