Great info jd, as they say "A picture is worth a thousand words" The few I recall seeing (and I mean fewwwwwwww) that I suspected had an internal discrete resistor had a prounounded ring/groove about 1 inch or more down from the top that looked like a seperate compartment. Still in years and having been a used tractor dealer I never ran across anyyyyyy that looked just like your neat picture and would still say the majority of the non ring or non your picture type 12 volt coils (what some call internally ballasted) DO NOT have such an internal pure resistor but either more wire length/turns or more resistive wire in order to come up with the resistance sufficient to limit points switching current to around 4 amps to avoid premature burning.
Again, GREAT PICTURE n thanks for more info, we (or us sparky types) got a lot of mileage out of such a simple but interesting lil coil question.....
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