1947 Farmall Cub

It depends on what numbers you believe, and later Cubs had a bit more HP than early ones because IH turned up the RPM.

According to the 1947 Nebraska Tractor Test belt HP was 9.23 at 1601 RPM.
The 1956 test gave 10.39 belt HP at 1800 RPM.

Of course those aren't engine HP numbers. They're after losses in the right angle gear box for the belt pulley and anything the belt wastes.
 
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