Beautiful in dramatic black ice PVD finish, the 1941 Replica is identified by several characteristic features, including a four-barrel hinge that joins the lid and bottom (the current Zippo lighter has a five-barrel hinge.) Flat front and back surfaces meet the sides with sharp, less rounded edges than current models. Sides of the inside unit are flat, with squared edges where they meet the front and back surfaces. The inside unit has fewer holes in the chimney than current models and is also fitted with a hollow rivet that holds the striking wheel in place. Refill with Zippo premium lighter fluid for dependable, long-lasting service. Distinctive bottom stamp identifies this lighter as genuine Zippo.