Jean Painleve was a famous French underwater photographer who lived from 1902-1989. He led amazing life – being interested and involved in so many things. During the Deco period he started making jewellery from brass and galalith. The first pieces involved seahorses and he progressed to salamanders etc. These were sold in Parisian boutiques. These interesting items of vintage costume jewellery have become very collectible and hard to find. Sometimes they are marked JHP. There is plenty of additional information on Google.
