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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