Good evening ammunition experts.
Could you please help me with identifying this shell case. I believe it is from WWI. I see 1916 number on it, which might be the year of production. I wonder what kind of shell it is, what weapon would use it and also what is the meaning of all those numbers. These shells were made into steam toys. The diameter of each shell is 10 cm or about 4 inches. The length is 12 inches.