Yes, the vast majority of 12 volt systems in the USA use what you are calling a "6 volt" coil. More then 75% of all cars and trucks with breaker points used that style. Same coil in a Deere 6 volt tractor is used in a Deere 12 volt tractor.
A 12 volt system has to make spark at 9 volts when cranking and at 13-14 volts when running. So various systems use differing strategies to accomplish the task. Ballast resistors, differing values in the primary and secondary windings, etc.
If you look closely, many 12 volt coils for sale also list usage for 6 volt systems.
The so-called "12 volt" coils have a higher resistance in the primary windings inside the coil and thus do not use an external resistor.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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