I think he will have a very tough time trying to find for a 1938 O4 tractor as they were based on the Farmall H that was introduced as a 1939 model and the serial number list on here only has the O4 starting in 1940. For a 1938 it would have to be a O14 based on the F14 tractor. So would make a big difference if it is an O4 or a 1938 model.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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