I owned a few Revelation LPs way back in the 1970s and 1980s, and decided to do some research; unfortunately, I didn't find much. According to the first edition of the New Grove Dictionary of Jazz, Revelation was established in 1965 in Los Angeles by John William Hardy and Jon Horwich, and moved to Gainesville, FL in the late 1970s. They released albums by Warne Marsh, Clare Fischer, Dennis Budimir, Tony Ortega (a few were also reissued on hat), Gary Foster, Joe Albany, Jerry Coker, Carmell Jones and Frank Strazzeri. Here's a label listing.