I do not know, but at times Scott sold various levels of brown International albums from basic to fancy. The covers differed from one to the next, from heavy cardboard to cloth to maybe even leather -- so maybe the more expensive version was the one with the spacers sewn in? As you'll know, it was a way to help spread the pages out a little to account for the problem that when adding a lot of stamps you got a growing bulge in the center of all the pages. The spacers pushed the bound edges of the pages out, as well, to help account for that. It must have been costlier to do it this way which is why I think it might have only been offered on the more expensive versions. But, as I say, I don't really know for sure.
Because of the bulging problem, a bound album is not a very smart way to make a stamp album, I have to say. I've also seen some albums (I think for Great Britain so maybe they were Stanley Gibbons) where every other page was perforated along the spine, so you could tear it out, leaving a kind of "spacer" along the spine. That accomplished the same thing, I suppose.
I have a standard-level 1940 Scott International, the kind with the blue cardboard cover, nothing very fancy. It has the bulge problem even though it's only maybe 15% filled with someone's stamps. Nothing I can do about it. Since most collectors probably never got very far with their worldwide collections, it probably didn't matter much. But with more advanced collectors who actually began to fill the album up, it must have led to some complaints. Maybe that made Scott add "spacer" strips for those better albums . . . ?
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