Big vintage enamel Shell sign

Vintage enamel Shell advertising sign with wear and rust. The sign was made in the Netherlands by Langcat in Bussum during the 1930s. This sign is a rare and unique piece. It has ears with a whole on each corner to hang on the wall. These ears are have a special patent that could only be used for products from Langcat. These ears where made to prevent the sign from damaging when it was getting applied to the wall.