My name isn't Bruce, nor do I have the CD (I thought I did, but I was mistaken).
Regardless, I remembered reading about that -- and sure enough, here it is on the product page. I'd hazard a guess that it's in the liner notes as well.
"...the Tom Jones soundtrack was a huge best-selling album on United Artists Records. The original LP was released in both stereo and mono - or was it? For years, it's been presumed that the stereo tapes were lost, because only the mono album master was in the vaults of MGM. However, as anyone who owned the stereo pressing knew, it wasn't stereo at all - both LP releases, despite what the album cover said, were mono - no stereo tapes ever existed - the score was recorded and released in mono only."