What bookdealers really mean. A dictionary by Tom Congalton and Dan Gregory (Between the Covers), with additions from other sources
"Other than," for instance "else fine" after noting some flaws. One distinguished bookseller claims that citing flaws and then calling a book "else fine" is akin to calling a girl pretty, "except for her face." But in the real world a book can have some flaws and still be a fine copy if the flaws are mentioned and are so minor as to not knock the condition down a peg.
Après avoir signalé les défauts d'un ouvrage, la description peut signaler "sinon" (bon exemplaire), ce qui veut dire que malgré ses défauts, l'ouvrage reste agréable.