WW1 German Officer's Clasp Knife S/n 0937

The reason I call these Officer's knives is because I can't see enlisted men having bottle's of wine on the western front Anyway the knife has a 4' blade stamped MERCATOR on one side and D.R.G.M. on the other The knife is 9' when opened and it has a can opener awl and a corkscrew and it is stamped MERCATOR D.R.G.M. on the underside S/n 0937 Price includes UK delivery