The history of the "GP" series of tractors is very interesting. I am by no means an expert on them but I have spent a lot of time looking at tons of examples. Many of the tractors that I have seen with an "A" on the serial tag have been small bore tractors with updated features such as crankcase breather assemblies and oil filters. There were so many ongoing changes and updates on these tractors it's hard to keep track of them.
These tractors were also being produced during the first few years of the Depression and often sat at dealers and branch houses for months (sometimes years) after they were built and shipped. Documents have been published stating huge inventories of pre-1930 "GP"s into the '34-'35 time period and probably well beyond. It made sense to update a lot of these tractors with "improved assemblies" to make them much more reliable (eg. oil filtration, ventilated crankcase, etc.) I have always thought of this as similiar to the pull- ahead design that auto manufacturers still use to update models before the update is put into full production.
Your tractor serial number is just prior to an important break at 226402. The most obvious changes at this serial number were to the cooling system and fuel tank if I remember correctly. I can get more details if you want. I would love to see any pictures that you may have.
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