It's possible to get more than one defective part.
Possibly they are coming off the same assembly line incorrectly made or labeled. Even if they are different brands, they may have come from the same manufacturer, just get a different brand box and part number.
The old can type coils are slow sellers now. Often, they get reboxed, relabeled, sold and returned, who knows what the original part number might have been.
General information, a 6v coil, out of circuit, when checked across the primary terminals with an ohm meter will read around 1.5 ohms. A 12v coil will read about 3 ohms.
Also a properly running coil will not be excessively hot. It should be about the same as the surrounding engine components. Generally if it's too hot to touch, it's too hot, something is wrong.
Any coil can and will be damaged by leaving the ignition on not running. They can even get so hot they burst!
I would do some tests on the next new coil, see if it is right before installing it. Check the running voltage across the battery with the engine revved up to governed speed. If it's 6v, it should be around 7-8 volts, if 12v, it should be 14-16 volts. Also be sure the points are properly gapped. Too close will make the coil run hotter than normal.
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