It is stamped « Capron Vallauris France ».
Biography
Roger Capron, France (1922-2006)
Roger Capron, born in Vincennes on September 4, 1922 and died in Cannes on November 8, 2006, is a famous French ceramist. After collaborating with Jean Derval and Robert Picault, Capron set up his own factory in Vallauris in 1952 and immediately enjoyed success.
To find out more, read this Wikipedia link.