There are some other external things you can look for. The 10-20 had 42" steel wheels, the 15-30 52". The steering shaft on the 10-20 is open almost all the way down to the throttle/spark levers. On the 15-30, the shaft is enclosed almost up to the wheel. The 15-30 has an extra strap over the gas tank, about 1/4 way back from the front. The pulley on the 10-20 is 15-1/4" x 7" and the 15-30 pulley is 16-3/4" x 9". There is also a difference in the appearance of the steering box, which I can recognize but can't really describe--don't have any pictures of it here. Most of what I wrote above came from an IHC tractor brochure from the early 30s, and I took the specs from a specs page. Hope it is helpful.
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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