The Opel Laubfrosch 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.
At launch only the two seater open topped Laubfrosch was sold. This had its rear end reworked in 1925. Already, from November 1924, an open topped three seater was available and 1925 saw the arrival of an open topped four seater. From November 1924 the three and (from 1925) four seater models were also produced with permanent fixed roofs.
A delivery van version with a door at the back turned up in November 1924. Further variations on the Laubfrosch appeared later in the decade.
Source: Wikipedia, 2011