The parts catalogs usually don't give a serial number break for the magnetos themselves as the same magneto was used on later tractors when they happened to be installed on later tractors. You need to look for something else that changed at the same time, like wiring, generator or whatever. As far as I know, for all models the change from a cut-out controlled generator to a full voltage regulator was done at the same time battery ignition was added. (Battery ignition added electrical load, so more charging power was needed.)
I didn't see the W-4 parts catalog on line so I took a quick look at the H catalog. I found the cut-out system was used through serial number 340953. From that, I conclude battery ignition was available from 340954. Before banking on that answer, I would check effectivity on a few other parts. I didn't do that check. 340954 was more than half way through 1950.
You can check other models the same way. You will get somewhat different dates for the change.
Export tractors may have varied considerably. But that is what the catalog shows for US delivered tractors.
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Today's Featured Article - Tuning Up Your Tractor: Cooling and Fuel Systems, Hoses and Belts - by Curtis Von Fange. Our tractor is coming right along. The old oil and filter has been taken to the recycler and the air filter replacement has breathed new life into our motor. Let's take a closer look, now, at the cooling system since it has to work so hard in the summer heat. Cooling systems can be real cantankerous in their old age. Radiator cores clog up with rust, lime or other mineral deposits and the fins clog up with weed seeds and debris. The metal headers slowly corrode away from years of use and
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