At the beginning of the film, when Partner (Lugosi) ships the coffin-shaped wooden box, he is charged £4 and 6s. That would equate to about $264.00 in 2015.
Filmed November-late December 1939. Bela Lugosi completed this feature after Ninotchka (1939) and before Black Friday (1940).
Egyptian King Amenok III, said to have died 4000 years earlier, is entirely fictional.
This is one of five Saint films that Jonathan Hale appeared in, portraying Inspector Henry Fernack in all five.