The above typography appears on the covers of at least three RCA Victor LPs from 1956 and 1957, one by pianist Hal Schaefer, another by polymath-bandleader George Russell, and a third by saxophonist/clarinetist Hal McKusick. Of the series, Schaefer explained: "I was invited to participate in The RCA Victor Jazz Workshop. You had to be a composer, arranger and instrumentalist, all rolled into one." (Which abundantly explains Russell's inclusion.)
In each case, the album covers are photographic, the "Jazz Workshop" logo branded in a corner. There's no typographical credit, yet the intricate lettering appears to be the handiwork of Flora, who often toyed with typography and illustrated dozens of RCA Victor (front and back) covers between 1954 and 1961. The letter fills reflect Flora's painstaking mischief.
One Floraphile insists on the benefit of the doubt. That would be me. Until proven wrong, I remain insistent.