Okay....so they aren't the old solid brass Eagle 66 oil cans. The old one on the left has a hole that was poorly soldered in antiquity.
These are probably 80's or 90's manufactured steel coated brass. Two are NOS, fresh out of the plastic bag.
I've watched for these oil cans at the flea market for nearly a decade. I found one before today and it's in the picture. I bought 3 today for $10 each....
The wider base is a huge improvement. These little guys fire a small amount of oil at high pressure. I think they are ideal for putting oil deep into a hole while drilling. Right now all three are going to hold dark cutting oil.