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Seven digit serial numbers begining with less tha 42 use the old six digit formula. In 36 and 37 the production exceeded the number capacity that would fit into the formula. They had to add a digit in the middle to accomodate the higher production. 42x0xxx would be a 38 model using the 42 up seven digit formula, while 40x0xxx would check good for a 37 rather than a 36. For the six digit numbers (and 7 digit less than 42): The first fourth digits represent the year model while the remaining digits represent the actual sequence of that basic model of machine. Example: My L, L351234 would be 3xx2xxx for the year code, or 32-3 for a '29 model and was x51x34, the 5,134th L based tractor built that year. My C, C308720 would be 3xx7xx or 37-3 for a 1934 model and was x08x20, the 820th C based tractor built that year. I'm sure the 38 to early 53's use a very similar system but best I can tell the sequence numbers no longer differentiated between models but sequenced all the models together. Hypothetical example: DC4815432 would be a 1948 DC and was the 15,423nd tractor produced by Case in that year. After Jan 1 53 they went to block sequence numbers. Whew!
I hope I didn't commit too many errors in all this so it can be understood a little bit.
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