Great war 18pdr cases, Can anyone tell me more?

[Reg]

Hi Gents

These are the first pieces of great war militaria trench art that started my collecting, they were given to me by a relation many years ago, with no story, other than that she could always remember them in the lounge at the farm she grew up on, the "beer" tankard has a handle made from 4 303 cases I think dated 1914 (well, G14 anyway) and the other three shell cases are all early or pre war dated, I like the surface finish on the 08 example, like a mirror, compared to the very rough machining on the 1916.

Anyway, there are a myriad of other stamps, I wonder if anyone on here could tell me a little more from these.

Thanks in advance

Reg