By 1970, many of these covers had a uniform appearance, predominantly painted illustrations on black backgrounds with the titles set in Roberta, one of the Art Nouveau-styled typefaces of the occult revival. All the Alessandrini covers date from the late 70s and early 80s, and show an evolution of the imprint’s style, with the same black livery but a different typeface that I can’t identify (Coliseum is the closest digital equivalent), together with artwork that’s more of a design rather than an illustration of the book’s contents.
As a kid, I spent hours at used bookstores and combing through the books at charity shops. The books themselves were good, but the covers were their own quest and reward. There were so many paperbacks and designs over the decades that stocked those shelves.
Original source: Jean Alessandrini book covers