Thanks for posting those added pics, Martin. It looks to be in fantastic condition, too, with no fold splits or separations.
And here's a pic of the Dwight Cleveland stamp on the back of the Arg. OS. It was done in such a light gray ink, that it shows as lighter, so I boosted the contrast to make it more visible. I really like the old style camera on the tripod that he included as part of his archive logo, too.