Unknown 4inch (?) shell.

[charley777]

Greetings all.
Can anyone please identify this shell?
The diameter of the base is about 101mm.
The length is 291mm.
It is solid and therefore quite heavy.
It looks wrong stuck in the larger 4inch cases in my collection.
The only discernable marking is W2 in a circle on the driving band.
I am supposing that it is rather old .
Thanks.

 

[2pounder]

4 in shell

looks like a type 11 band used on 4in BL mk VII and VIII guns, ref 1915 treatise. have seen 6in round nosed solid practice proj. of inter war years. suggest you explore along these lines for further info. 2pr