Yes, that would be interesting to find out. Let me know what you hear when you pull it out... :-)
I started to play the Beatles For Sale Flac in Mono and it sounds more like the way it should (and the way I remember it).
I think the album was originally done in Monaural sound (as were most recordings back then) since there weren't too many stereo recordings made as the technology was still fairly new.
I think the first Beatles stereo LP that came out was a few years later released on Capitol as "Beatles VI".