It should have a soldered seam, that's a way to help date the can but I believe that this is from the late 30's to mid 40's just by looking at the paint and how it looks compared to other cans I have from that age. Post a couple more pics like the seam and reverse side but not as zoomed in.

Oilzum, 1qt Oil Cans, Gas and Oil smalls, Oldsmobile collectables.