Question: What's the difference between an unstyled tractor and a styled tractor?
The tractor on the right is an early Model G; it is unstyled. That means it has no sheetmetal parts except for a simple hood that protects the fuel tank. You can see the radiator.
Question: How do I tell an unstyled A from an unstyled B from an unstyled G??
If you could line them up side by side, the size difference would be obvious. The G is the largest, then the A, then the B. When you see one alone there is nothing to compare the size to, so we will look at other details. The surest and easiest way to tell is to sneak up to the tractor and read the serial number plate. When that's not possible, focus on the intake stack, the exhaust stack, and the steering post.
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