This is a used Castrol Two-Cycle Motor Oil empty quart cardboard can.  I've had this can from the early 1970's in my collection.  Has shelf wear. The metal top has no rust and bottom has minor rust.  There is a small dent on the C in Castrol.   Very good can for over 40 years old.  Great addition to any collection.  Please look at the pictures closely, do your homework and ask questions before bidding.