(1.) This is a Fournier forgery of the entire stamp.
(2.) There is no dot in the center of the cross on top of the crown.
(3.) Circular rather than oval "handles" at the side of the crown.
(4.) The outer circle touches the bottom of the "correio" t under the "R's". The circle in the genuine is completely clear.
(5.) Large margins.
(6.) Exp: S.Washburne