Just wondering if anyone has come across any numbers like the following. The numbers are a really long way outside any of the US numbers. I have RT3 numbers that sit a little past the US numbers, but this AT number is so far away from anything? I'm in AUS by the way. It is closer to a MX model, but still a really long way ahead?
Thanks





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I can only think of two scenarios ...
That's likely a real Australian / (Oceania) serial number (that differs from our USA numbers)
or
2. The 1st number = AT1 - "4" ... is an altered "1" , which would make it a 1970 AT1 Enduro
So . . . Originally > AT1- 136421 , that someone changed to AT1- 436421
This could be possible (but unlikely), if the number "1" was stamped very lightly at the factory.
If it has the frame mounting provision for a key switch (under the fuel tank), then it has to be a 1970 AT1 Enduro model.