Apparently a GEHA or, more likely, a REMO shotgun. These two-shot repeaters were made on M98 Mauser actions, either ex-military or made from left-over forgings, from 1919 to the early 1920s. RwE = Reichswerke Erfurt was the 1919 – 1920 name of the former Royal Prussian Small Arms Factory in Erfurt. Immediately after the end of WW1 they tried to convert to civilian production. They made M98 hunting rifles, such Remo shotguns and Ortgies pistols until their dissolution in1921 due to the Versailles "peace treaty".
The Remo shotgun was patented by the Rempt brothers, Suhl. Here are two photos of such a RwE Remo action. Several articles on these guns may be found in "Waidmannsheil", a publication of the German Gun Collectors Association, www.germanguns.com