Your copy seems to conform to a 9th printing variant, the one with an ISBN. I don't think it's particularly rare, and all but the most pedantic won't care at all.
But I think you're on to something there. Clearly, there is something "in between" our current 9th and 10th printing descriptions, or the description(s) are flawed in some way, or both. I don't know if it's worth going through with a fine-toothed comb, though.
Your question prompted me to check, and I have a copy that conforms to the 9th, but with an ISBN (like yours),
and with a sticker...which goes against the description listing.
Also, it seems like we have a bug in there where "Trampier" is misspelled "Sutherland"...
