These are old 12 gauge brass shotgun shell casings from Italy.
full brass cased 12 gauge in a semi auto?
Koreana Autumn 2009 (English) by The Korea Foundation - Issuu
Antica Fabbrica D'armi Luigi Franchi 12 Ga. Over/under
Vintage Russian STEEL Case 12ga. Shells - We test them
Gold Bullet Shells - UK
Spent Ammo Casings
Why hasn't a modern gun manufacturer developed and sold an exact replica of the German luger in multiple calibers? - Quora
Double Demon - Lot of Paper Shells - General Ammunition Discussion - International Ammunition Association Web Forum
Winchester No. 12 Brass Shotgun Shells Circa 1890
Canada Brass Your Source for Reloading, Accessories and Parts
Spent Brass 22 Casings
Double Demon - Lot of Paper Shells - General Ammunition Discussion - International Ammunition Association Web Forum
Double Demon - Lot of Paper Shells - General Ammunition Discussion - International Ammunition Association Web Forum