I've got two of these, 1970 & 1971, based on the labels. I also had the white one, which was older, but that went to my son, I did not care for the colour and specifically was looking for a white one.
Now yours looks fine to me. Could you specify what worries you with the jacket? If it's the length, well this one is marked long. Maybe something else?
i do seem to remember these being short, mine just covers my belt line. in all fairness, any other Lee Rider i have had in my life would have been from the early 70's on, and from what i understand when they added the hand warmer pockets the basic "cut" of these changed also? is this true?
there are a couple things that tend to make me think this may have been a second and that is why the condition is so supreme. the horizontal hem above the pocket flaps does not line up properly and the zig-zag stitch running vertically from button hole to button hole seems a bit erratic. those 2 items and the length were basically my only questions.