It is believed to be from the Vietnam War era (1961-1975), although there are no visible marks to confirm this.
Vintage Metal Military Canteen With Handles And Metal Flask Great For Camping
Vintage Oasis Water Bottle/ Canteen With Shoulder Strap, Ex Military?
Vintage military 1979 aluminium canteen with sleeve made in East Germany
US Military WW2 1945 Metal Water Canteen with Nylon Pouch and Cup Set AGMCO
MILITARY WATER BOTTLE green camouflage flask army canteen with camo belt pouch
Antique Military Canteen Army & Navy CSL London Copper Water Flask Pre 1934