Altbier is a German top-fermenting beer that originated in the historical region of Westphalia and then spread to other nearby German regions. The name Altbier, which means old beer, refers to the pre-lager brewing method of using a warm top-fermenting yeast.
Füchschen, Uerige, Schlüssel and Kürzer are all brewed and sold in the Old Town (Altstadt). Schumacher is located between the Altstadt and the main train station (Hauptbahnhof), although it also has a pub in the Altstadt, Goldener Kessel, directly across the street from Schlüssel. In 2012, Zum Schlüssel colloborated with the Creemore Springs brewery in Ontario, Canada to produce an Altbier. (Source: Wikipedia)