This is a container for a Mk. 10 unguided Rocket that was used Late in WW2 and through the Korean Conflict. Would have been used on the AD-1 Skyraider, P-51 and other fighters. I don't know if the P-80 or other early jets used that Rocket. This may have been a Navy version only speculating due to the gray paint.
It is 39 inches tall and 7 inches at the widest. It would be a good collectors item or maybe made into a lamp. The only other one I have seen was a 1946 and was exactly like this one.