Many of the early 7.7cm Feldkanone 96 n.As have two cyphers on the barrel - a state cypher and the Imperial cypher.
The Prussian state cypher is pretty common but I've found one I'm not sure about - it's on a gun at Beaufort in Victoria, Australia between the muzzle and the Imperial Wilhelm II cypher. I think it might be the cypher of Brandenberg - anyone confirm?