I am looking for a brass case for 18pdr marked 1917

[Flavio]

Hi guys, I was looking for a brass case o shell case for an inactive 18pdr bullet purchased some time ago at a ww1 flea market by my son. I wanted to give him a graduation present, Unfortunately I looked here in Italy but they can't be found, do you have any suggestions of any sites or sellers, France or England, who deal with them? I would need one dated 1917 to match the dates of the bullet and if possible that it hadn't already been polished. Thanks for anyone who can give me suggestions