Antique Metal Water Canteen - Box Style, 12'L x 8" W x 2 1/2" Deep.  Metal seems to be aluminum.  Possibly used in an automotive carrier, maybe military.  I am unable to find any information regarding this item on Google or on any other database or search engine.  Very heavy; this small canteen weighs 4 pounds.  The metal seems very thick; obviously made to survive harsh conditions and traumatic encounters.