Isn't It A Pity
I have no info for this specific disc.
There's no indication if this is version 1 or 2.
However, the 'mono' designation is quite interesting. Is this an actual mono mix or is it simply collapsed stereo?
Specific recording details are not well known. Sessions for "All Things Must Pass" too place between May-October 1970 at Trident and Apple Studios.
See some additional details - here