1940s - 50s vintage milk or cream can, aluminum with steel wire handle. It's made for carrying milk (not milking the cow) but from the rough looks of this one, might well have been used for both!
It's dented and missing the lid, but it's water tight yet and would make a great bucket for cutting flowers. Measures about 10" tall, 14 1/2" to top of handle. Bucket is about 5 1/2" in diameter.