UPDATE - 26 OCTOBER 2017
I just received an email from JanSport Customer Service (after I had sent them the pictures you see below). They still maintain that the subject backpack is a Cascade model. I'm not totally convinced, but have to accept their verdict unless someone here comes up with some clear photos that will prove JanSport wrong. If and when such evidence arrives, I will award that post as the best answer to this question...
END OF UPDATE
I acquired a JanSport external frame backpack in the early 90's from a thrift store - it was used.
I recently hiked a few sections of the Colorado Trail and said backpack attracted lots of interest, since it was so old. I got several questions about it, but was unable to provide much information.
Here are some pics of my backpack.
I've asked JanSport Customer Service about this. While they were very helpful, and even shipped a part I needed for the backpack, they've been unable to correctly identify the backpack. They guessed that it was a Cascade model, from the early 80's. They scanned a page from a 1983 JanSport catalog and sent it to me:
As you can clearly see, my backpack is not one of the three pictured on said scanned catalog page. Of the three backpacks pictured on said page, mine is closest in appearance to the one on the left, as that one has a straight upper-most crossbar. It is interesting to note that, of the two Cascade models depicted (the two left-most backpacks pictured on said catalog page), the one for the larger torso has a straight, vice curved, upper-most crossbar. One wonders if that would be true for my backpack, as well.
Can anyone provide the model name and year of this backpack?