THIS IS JUST A COOL THING TO OWN. RARE AS IT IS A ONE OF A KIND AND THERE IS NO SUBSTITUTE! The Hopi Overlay design was handmade on a sterling silver plate and expertly added to the ZIPPO lighter. I do not know anything about collecting Zippo lighters so corrections to misinformation is welcome!!! The Zippo script logo was developed in the late 40s and was phased-in on the lighter bottom stamp around 1955. In the late 70s the logo was redesigned. In 1958 PAT. 2517191 moves in the middle and in 1967 there appeared to be no more number. This wonderful vintage item comes with the box and the documentation that has never been removed from the inside.