AFriend of mine bought a S7 a few weeks ago at a farm auction in Kansas and the machine has a serial # of 3UDT. Does any one know the difference from a 3UOT? Everything I have looked up on the S7's have a serial number starting with the 3UOT. He got the parts book with it and its for the 3UDT. It was built in 1955. Thanks, dpull
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