One requires the external resistor, and will say "Use with external resistor." The other has an internal resistor, and will say "With internal resistor." At least, they should on the package.
The 12V coil that requires an external resistor is exactly the same as a 6V coil.
Why do they call the coil 12V if it requires an extra resistor? Probably to simplify things for less mechanical folks with early 12V vehicles. It doesn't make sense to some people to buy a 6V coil for a 12V vehicle.
If your H runs fine, leave the resistor. The coil will burn up if it's the type that requires an external resistor, and you remove the resistor.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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