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
Side view of featured stein 
Rare coloured lithophane which forms the base of the featured stein. 
Porcelain stein with an internal painted capacity mark. Pictures supplied by Andre Ammelounx The Stein Auction Company 
The L & H flanking the anchor's shank, indicates that this stein was made during the stewardship of L. Hermann, dating this stein between 1882 and 1905. 
An alternative and extremely attractive lithophane on a Rheinische Porzellanmanufaktur stein. 
View from under the base, showing that the coloured lithophane above is produced by putting daubs of colour in strategic places on a standard thick / thin lithophane.
L. Hermann's mark on the above lithophane, shows that this example is dated after 1882. 