Oberkassel bei Düsseldorf (now a suburb of Düsseldorf) North Rhine-Westphalia
Hersteller / Manufacturer
The company was founded by Oscar Erck in 1861 as Rheinische Porzellanmanufaktur-Oscar Erck.
Taken over by L. Herrmann in 1882 to become Rheinische Porzellanmanufaktur-L. Herrmann.
Due to poor business, the company is thought to have ceased production circa 1905 and then probably deregistered in 1913.
Reference: Porcelain Marks & More Stein Collectors MySteinCollection