Davison Fandango’s Ornamental style, used in all caps on the cover of Edward Pearson’s fantasy novel. The Pocket Books edition came out in 1974. No cover designer credited. The illustration is by Michael Gross.
From the back cover:
Chamiel is the sweeping saga of the Revolt of the Gods, in which Zareal the Black Angel and his hosts of Evil defy the eternal edict, invoking the wrath of the Lord and the forces of Michael the Vanquisher. And in which Chamiel, messenger between unearthly kingdoms, undertakes a bold and perilous exploit on behalf of his Lord.
The legend of Chamiel is a heroic fantasy in the tradition of C.S. Lewis and J.R.R. Tolkien, a legend set in its own worlds of Earth and Paradise—and the twilight world between.
“The writing is surely excellent; many passages have a vivid unearthliness… Exotic yet coherent imagining … bold and unusual.” —C. Day Lewis.
[More info on ISFDB]