Rare amulet of a " Manus fica "

Roman Period (C. 30 B.C. to A.D. 392)
 
Rare amulet representing a hand called "fist, thumb between the first and second fingers." It is difficult to define exactly what the function of this amulet was.
 Green stone.
Length : 0.79 in.
 
Collection B.-M., Paris, bought in janvier 1977, Paris. 
W.M. Flinders Petrie, Amulets, p. 11, n° 13a. Plate I, n° 13a.
Ref. : HA-054-6