1) If the coil is labeled something like "12 volts for use with ballast resistor" or "12 volts requires external ballast" its in reality a 6 volt coil and will work okay on your 6 volt tractor.
2) If the coil is labeled something like "12 volts" or "12 volts NOT for use with ballast resistor" its in reality a 12 volt coil and the spark could possibly be weak.
3) If it starts n runs fine it must be okay.
Many (not all) typical old tractor circa 40's thru 60's 6 volt ignition coils were around 1.25 to under 2 ohms (1.5 typical) primary resistacne while many (not all) 12 volt coils were around 2.5 to under 4 ohms (3 typical) primary resistance. Many tractors still used the same coil on 6 or 12 volts, its just that if on 12 a series voltage dropping (12 to 6) ballast resistor was added in series with the coil.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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