The listing shows VIN 019126. Which, confirmed by the data in the Tech Manual, would have been produced in June, 1970. Since new model years for many manufacturers were scheduled for sale starting in the fall of the preceding year. It would not be unusual for a car with few cosmetic changes, sold in the fall, to be titled as the next year's model. For a car produced in June and shipped to the US a few months between production and sale, to me, would not be out of the question.
I actually have a newer example where my SL 550 (R230) was built in December 2009 but sold and titled as a 2011.
As stated, your VIN seems incorrect, you might want to recheck your number.
July 1970 production began with 019242 and ended with 019991 according to the tech data production info.
Norm