I got mine in 85 and the serial # began with K. It went left to right on the BB where some of the older ones in town read front to back, and did not have a K. Also mine has SKYWAY stamped next to the serial #, where the older ones I saw did not.
The only reason I remember this, is because mine got stolen when I was a kid, and there were only 3 Skyway TA in my whole town. You would bet I checked the other two every time I saw them. I was 8 years old in 1985.
Not sure if this helps or confuses.