German 15cm schwere howitzer 13 cartridge case which is separated propelling charge found on the Somme battlefield 1916-1918

Very nice condition German 15cm schwere howitzer 13 cartridge case which is seperated propelling charge. It is pretty much undamaged with no real discolour. The case still retains its brass colour lovely and clean. The case is complete on the bottom with its original markings and is dated January 1918. The case is from a private collection on the Somme. A very nice and not easy to find German artillery relic from the famous Somme battlefield of 1916-1918.