Sweden Stockholm Unknown

You have a lovely set of "Poster Stamps" (Cinderellas)

and.....
1972 labels for the Trelleborg-Sassnitz Ferry
(ID by SCF member Postmaster GS)

Click to enlarge

The most obvious feature these stamps lack is a denomination. That should scream to you that they're not postage stamps, so wouldn't be found in Scott or any other postage stamp catalog. While not an absolute rule, one can say that for 99.99% of all issues pre-1990, since the UPU all but required it.
By the same token, they're not fiscal/tax/revenue stamps, so wouldn't be found in those reference works, either.

But for domestic use...

I did say the rule wasn't absolute.