SD3055 is not a valid model number as far as I know. The only model number that I can find in my references that starts with SD is the Super Dexta, but that should start with SDX, not SD3.
A true 1980 4100 model number should start with KA1 or KA2.
A 1970 Orchard version of the 4000 should begin with D34.
A 1970 Narrow Orchard version should start with D33.
A 1970 Vineyard version should start with D30.
0F2B could be June 2 of either 1970 or 1980.
The serial number beginning with an A indicates that it was built at the Antwerp Belgium factory, but the A serial numbers are not well documented, so it could be a 1970 or a 1980 tractor.
Post some pictures and we could probably tell more. Is the tach cable driven off of the rear of the generator, or off of a spot on the engine block next to the oil filter? Does the tach read zero rpms when it's pointing to the right or to the left?
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