They were fooling with the way that the body, and the routing, was accomplished, around that time. We see just a few years later, these strange shaped Fender Tele bodies and this, I am told, was because the old routing approach would not accommodate the new tools they were using. Especially 72, 73 and 74 on. So, I'm prepare to guess, maybe that's why the "new" routing shape happened there in 1968/69. Seriously, I never wondered to myself why it had changed, and this is all I can think of. Anyone else have any ideas? Now, I'd love to figure this out.