The long lost sorcerer's handbook, compiled in 800 A.D. by the "Mad Arab" Abdul Alhazzred lives on in the mythos of H.P. Lovecraft...
More fun ads like this here: https://archive.org/details/ads_20230409/page/n47/mode/2up
I can't imagine the utter disappointment of the undoubtedly many customers receiving their order an unpacking it: the real Necronomicon was supposed to be bound in human skin while this one is in mere leather (real or faux?) ;)