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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