The article was in the July-August 2007 Red Power. Go back and read it. If you don't have a copy, the back issue is still available. There is a table with the article that lists the symbol, and advance degrees/rpm for every version I could find (37 of them).
The proper symbol for most tractors is given in the model's Parts Catalog. The Seviceman's Handbook "Engine Tune-up Specifications" lists the symbol(s) for each model built through the publication date, which was 1966.
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