Dear cem:
the gun has similarities to a a historic battery in the principal naval base in Argentina, also I think is similar to guns installed an used in Turkey during WWI. The model is made of steel and in 1/32scale , it was constructed by the father of a friend that passed away. So unfortunately the model is unique. I have other two guns made from the same person a Skoda 305mm howitzer, and a british railway gun both in 1/32 and also made of steel. regards