This shell is 24 inches long, has a 5 3/4 inch circumference around the rim and 3 1/2 inches at the other end where the round use to be attached. The markings on the bottom are; 20 Pr Mk 2 Lot 23 RLB RW18 1947 OF. The removable primer area is marked; 17 Mk2 CY 55 2/49 CD 48 RML. I am trying to find out what it is, where it was used, history, value, etc. Any help is appreciated.
Regards Mannie
Regards Mannie

