Whats the round ring hole plug in the back top of it? They could coat the inside (if done) from the front hole, why the back plug...is it a knockout for a fuel pickup tube perhaps? I've just never looked over early cans in detail as much as I should.
Came across this one, lid needs some work, but would be glad to let it go for $50 with a free ride to the Aberdeen show for pickup.
V/R W. Winget