A German breed originally. From http://www.omlet.co.uk/breeds/breeds.ph ... ed=Vorwerk
The Vorwerk originates from Hamburg, Germany around 1900 and was developed by the German breeder Oskar Vorwerk who gave his name to the breed. He developed them as good utility birds with belted markings combined with buff feathering rather than white. They were first shown in 1912 and are thought to have come from Lakenvelders, Orpingtons, Ramelslohers and Andalusians.
Beginning in 1900, poultry breeder Oskar Vorwerk began to create a medium-sized, utilitarian fowl with the belted plumage pattern of the Lakenvelder. The key difference in appearance would be the Vorwerk's dark golden base color, rather than the white of the Lakenvelder. Thus, his chicken is sometimes called the Golden Lakenvelder, especially in North America. Breeds used to create the Vorwerk included the Lakenvelder, Buff Orpington, Buff Sussex and Andalusian. By 1913, the Vorwerk was standardized. However, it never really gained widespread use, and is rare or non-existent outside Continental Europe. 
Australia has three of those birds. I've not ever heard of a Ramelslohers and a quick browse seems to indicate it might be a very old breed that may no longer exist ...