By A Mystery Man Writer
These vintage brass shell casing i believe may of been for tanks.
Shell Cases and Ordnance
Cartridge case terminology and identification – Stephen Taylor, WW2 Relic Hunter
Trench Art – The Militaria Shop
Three Volley Salute Military Tribute Brass Shell Bullet Casing Engraving Service
Lot - A WWII 5 inch brass naval shell casing (31 x 15cm)
Ammunition
Civil War Weapons in the Shenandoah Valley (U.S. National Park Service)
WW2 1942 British Dated 20mm Oerlikon Ammunition Shell Casing in Ammunition
Heavenly Metal: How Trench Art Keeps the Memories of Soldiers and Their Service Alive
What is the Scrap Value for Brass Shells? - Interco
Large WWII Trenchart Shell Casing Ashtray. 1942-43 Pacific Theater