This Rock-O-Rama sub-label reprinted many titles from other Rock-O-Rama imprints. A-Z Records did not appear on any of the early releases, but it was printed on the disc of some of the later CD-R editions. There appears to be no rhyme or reason as to why certain titles were reissued on this imprint. Some has been released on other, still active, sub-labels only a couple years previously.
None of these releases have a production date on them unless it is left over from the original edition. Dates are estimated as best it is possible based on the press code on the CD in comparison to other releases from the same pressing factory. Best guess is that this imprint started in 1997 and continued for several years. It is nearly impossible to tell as the later releases were all on CD-R and therefore can't be compared by the press code.