Cook, Arthur B.: Zeus: a study in ancient religion (Band 3,2): Zeus god of the dark sky (earthquake, clouds, wind, dew, rain, meteorits) (Cambridge, 1940)

Plate LXXIV

A bust of Zeus Sarapis {supra i. 188 ff.) in lapis lazuli, presented
by Sir H. Howorth in 1912 to the British Museum (Brit. Mus.
Cat. Gems1 p. 368 no. 3939 fig. 94). Height o-i3im. A socket
worked in the top of the head implies the insertion of a kdlathos.
The technique points to a date c. 300 a.d.