The Opel 4 PS, popularly known as the Opel Laubfrosch (Opel Treefrog), is a small two seater car introduced by the then family owned auto maker Opel, early in 1924. Subsequently, various versions of the little Laubfrosch were produced until it was replaced by the Opel 1.2 litre, itself a direct ancestor of the first Opel Kadett, in 1931. Initially introduced as the Opel 4/12 PS, and manufactured at Opel’s Rüsselsheim plant, this was the first German car to be assembled on a Ford inspired production line. It was aimed at the lower end of the German auto market, and clearly intended, by the standards of the day, for volume production: it sold well, with approximately 120,000 produced by 1931.
