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The engine number is not the factory VIN. . If anything it would have been just part of it. But in the 70's it was not required they matched.
A title search under the owners name may help.
From HD Quote" 1970 through 1980 VIN number is located on the engine right crankcase and is the same as the number located on the frame steering head" end quote. This Sportster is a 1973 model.
