FOR SALE FROM MY OWN COLLECTION!! Double stamped WWII Zippo lighter Black Crackle 3 Barrel hinge Completely of steel (Zippo was not allowed to use copper during the war years, this was necessary to make ammunition, hence these Zippo's are made of steel instead of copper) Horizontal flint wheel Stamped interior Round bottom. Everything as it should be A lot of Zippos were needed in the wartime, when they were out of lids, the bottoms with ZIPPO stamp were used for this Hence, some Zippo's are stamped both at the bottom and at the top However, these are extremely rare The stamp on the lid has faded quite a bit, but it is still clear that it is also stamped A UNIQUE OBJECT