 The red and blue stamp's vignette depicted Army JN-4 #38262, the aircraft that made the first Air Mail flight from Washington two days later, and the 24 cent fee it represented was apportioned at two cents for postage, 12 cents for air service, and 10 cents for Special Delivery.On July 15 the rate was dropped to 16 cents for the first ounce and 6 cents for each additional ounce, and on December 15 the rate was dropped again to 6 cents per ounce when Special Delivery was made optional.Additional monochromatic stamps of similar design to C-3 were also issued contemporaneously with these rate changes in 16 cent (green) and 6 cent (orange) denominations.