This particular tractor is from late 1962 had just finished bush hogging this field which had weeds up to the bottom of the muffler and some small trees, this tractor wasnt even breakin a sweat, ran at 15 to 1600 rpm the whole time was mowin. the 1962 thru june 1963 tractors had the orange wheels and were rated 39 to 40 hp with engine speeds up to 2200 rpm.