Agreed, looks like 568 to me. My four digit is close to 10k in serial and has no hole on top either. Very cool to see that axle. What's on bottom right of steer tower? Hour meter? It's looking like you got a very early one, WOW, awesome. Love seeing the differences in this model as the serial progression happens.
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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