You are looking at the ENGINE model and serial number (it's a 404 cubic inch engine), the TRACTOR serial number is on the back above and to the right of the drawbar.
From the ENGINE number you posted, I'd suspect the engine is from a 6600 or 7700 combine, which likely explains the oddities you are seeing.
Is the serial plate upside-down, the combine engines typically were, as you had to bend over the engine from the front, then, from that angle, looking at the back of the engine, the number was easy to read.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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