Since 1838 silverware sold in France must bare the makers mark which is in a diagonal frame and a hallmark which is a Minerva head with 1 for sterling silver and a 2 for 800/1000 silver.For smaller pieces the symbol was a wild boars head or a crab.In 1961 the wild boars head was abolished and replaced with just the crab.In 1972 the 1 in the Minervas head was changed to the back of the neck. A date letter was also incorperated  starting with A for 1973.

Summary:

This hallmark is from a piece of sterling silver made in France between 1838 - 1972.