Ive just collected an early .177 hw80 and i was wondering if anyone could help me with an approximate age as ive never seen one like this?? It is stamped made in germany, has a square fore end to the stock, the hw80 stamping is slightly slanting and theres a gb badge in a circle. On the other side of the barrel breech it has weihrauch and something in german in the sausage? It also came with an original model 20 2.5x32 scope that looks from the same era. any help much appreciated, thanks john