It is possible that someone tried covering it up in the 80's, do you remember when you got it. The reason I say that, is that there were a few Mecca tracks that a few younger DJ's played covered up as they had never gone there and as far as they knew were unknown. I remember being at Hinckley one night and someone playing Innersection C/U, he was most put out when I told him what it was and that it had been played around the country in the 70's as well as being on the Soul Bowl, Front Page lists for a number of weeks.
The speed at which new or newish releases were being played there in the mid to late 70's could make your head spin.
Dave Thorley's post in C/u At The Mecca was marked as the answer