It is the Vibrations, it's listed in Checker discographies and has a # if you search but I think it's actually unreleased. Many checker / chess # listed in the discographies are actually unreleased and came from the studio info. This guy had it as an acetate, with a checker label glued on, but with all the info -- publishing, label #, titles, etc. handwritten onto the checker label. The checker label is printed but it's a label blank, so all the real details are written in.
So you DON'T need a scan of the vibrations on BET? It's the original release of "so blue" before checker. Thanks.