DonSellos - very small - like an usual stamp (Black Penny or so). Booklplates usually have "Ex Libris" written somewhere on them, and they are much bigger, of course. And usually don't have a gum (like this piece).
Although this has nothing to do with stamps, the earlier comment about bookplates (or book rhymes) prompted me to post this ... I had never heard it before but found it in the introductory page of an old 19th century genealogy of a family:
When I tried to look up the source for this rather ominous "book rhyme" I came up with this:
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