First use of Q for letter Omega?

[naraht]

I'm trying to research when the letter Q was first used at HBCUs to represent the letter Omega. This is almost certainly the same as trying find out when Omega Psi Phi itself used Que as an abbrevation, but I'd like to find out both when it was first used for Omega Psi Phi and whether the abbrevation came from inside the Fraternity itself or was first used by others (perhaps originally derogatorily?)

I'm not looking for a specific day or year (though that would be extraordinary). Comments like "it was in regular use by the 1950s" would be helpful..

Thank You
Randolph Finder