On a negative ground system, the coil's (-) terminal goes to ground, as well, through the breaker points.
Your's is backwards, which makes for a slightly less effective spark at the spark plugs.
When the coil's polarity is correct, the leading edge of the spark at the plugs is negative-going. Since the center electrode is hotter than the ground electrode, this makes it easier for the spark to occur, due to the "Edison Effect". (Electrons are emitted better by a HOTTER object better than by a COLDER object.)
On modern vehicles with a "waste spark" system that fires 2 plugs at once, one fires with (-) polarity and the other of the pair fires with (+) polarity, yet the engine runs well 'cause the ignition system has a HOT enough spark to fire even the reversed-polarity plug efficiently.
On your old slow turning, low-compression tractor, the reversed-polarity coil will be a problem only if the spark is marginal to begin with.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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