The self adhesive booklet you refer to does not have the adhesive applied to the wrong side of the paper. Actually it is correctly applied to the stamp paper and the backing /booklet cover paper which has the silicone shiny release paper as it should.
The normal Booklet number in the unitrade catalogue using the Scott numbering system is BK301. There are a couple differing ones having a different number of slits in the paper.
As I do not have my catalogue with me the number for this booklet you refer to would be BK 301?
The reason for the "no gum stamp" is because of a printing error. The sheet having the gummed stamp paper backed by the bookllet cover was fed into the printing pess upside down. Hence the stamp being printed on the ungummed backing/cover paper and the cover being printed on the stamp paper. This has been discussed before in the threads attached.
As for rarity or scarcity, I do not know of any official numbers, but it could be a few to several.
Mike
https://goscf.com/t/62012https://goscf.com/t/85283