I wanted to update this post to add a couple of great photos of this great Vintage Swiss Canvas/Leather strap just sent my was from Gabe, showing his new strap on his PAM312.
(click any photo to enlarge)
The Original Swiss Amry Rucksack dating from the 1950's was beautifully make with good strong leather bottom, sholder straps and trim and real wooden stays as an internal frame!
Also check out the detail on the hand stitched keeper, which I think really extends this design and is a work of art itself!
See the whole completed strap slide show: