I asked Mark Cederquistr and he replied:
"I don't think so. There's an adhesive mark on side A (Keynote 1303-A), but that could've been from any number of things like a personal label w/the owner's name to the music shop it was sold at to a cataloging sticker and Lord knows what else. The original label is smooth enough without any damage to think that there might've been a Mercury label pasted to the other side.
In any case, what you see above is how I got it in 2001. If there was another Mercury label on side A, whoever removed it did the best label removal job I've ever seen."