André Rivaud lived from 1892 to 1951. He comes from a family
of goldsmiths and seems to have been mainly involved in engraving medals. He
designed the 1945 ‘Shield and broken Chains’ definitives. As far as is known,
he only engraved a single stamp: the 1939 French definitive depicting Château
de Pau.
You will find André Rivaud's database HERE.