Thought id show these, got them sunday.Left hand round is 3 inch naval in gc 6os.Right hand round is a 68 dated 4 inch he projectile stamped CSR PROOF INRT RECV.This has a firing plug fitted.This was manufactured by FA.The case it sits on is a 1918 dated 4 inch case made by VSM with a no 1 primer. This case is in vgc which is rare.Any info on the 3 inch would be appreciated cheers Tony.