Extraordinary wind tunnel model of the MACCHI M.39 hydrocorsa (racing seaplane) with boot configuration, single-engine and low-wing monoplane developed by the Italian aeronautical company Aeronautica Macchi to participate in the 1926 Schneider Cup. Rotating propeller, nacelle with structure made of metal, metal boot joint supports. Wingspan approximately 48 cm, length 41 cm, height approximately 15 cm - Original model from the second half of the 1920s, in excellent condition