Cameo engraved with a winged Eros riding a chariot in the form of a snail’s shell and being pulled by two butterfliest

This iconography refers to the myth of Psyche and Eros. 

Bi-layered agate 
Roman art, AD 1st-2nd century
Dimensions: 1.3 x 1.8 cm
Mounted in a 19th century gold ring

Provenance: Formerly in the collection of Sir John Charles Robinson, C.B. (c. 1824-1913)
Formerly in the collection of Mr Wyndham Francis Cook (1860-1905), London
Thence by descent to Mr Humphrey W. Cook 
Formerly in an English private collection, London