Up for auction is a collectible silver bar from the prestigious "World of Flight" series, issued by the renowned Hamilton Mint in 1975. This specific bar commemorates the historic 1890 achievement of French inventor Clément Ader, who briefly lifted his steam-powered aircraft "Éole" off the ground. Technical Specifications: Material: Fine Silver (.999/1000) Weight: 1 Troy Ounce (approx. 31.1 g) Mint: The Hamilton Mint (USA) Year of Issue: 1975 Series: World of Flight Serial Number: 0616 Obverse: Detailed illustration of the "Éole" aircraft. Reverse: Engraved text describing Ader's flight: "Urging his bizarre 'Eole' eight inches off the ground, Clement Ader's 'flight' predated that of the Wrights by thirteen years." Condition The bar is in very good condition with a natural, authentic patina typical for vintage Hamilton Mint silver. It remains in its original protective plastic sleeve (seal).