Whoever mixed the paint for you may have mixed 68 or 69 B5 blue instead of 70 B5 blue. I think as time went on, each year got a little bit darker blue. I remember being at a car show once and seeing 2 B5 blue cars parked side by side. One was a 69 and the other a 70 model, and you could clearly see that 70 car was a little darker blue and not as bright blue as the 69 car.