By A Mystery Man Writer
Artillery Shell Casing - Canada
List of military headstamps - Wikipedia
9mm shell casings Stock Photo by ©dennissteen 7709883
Large calibre markings (The Western Front Museum)
Ammunition
Cartridge (firearms) - Wikipedia
Definitions and Information about Naval Guns - NavWeaps
Shell Cases and Ordnance
Royal Navy 4.5 Inch Shell Case - Sally Antiques
Ammunition
Reloadable .45 ACP Brass
Definitions and Information about Naval Guns - NavWeaps
Two 4.5'' shell casings.