B&W, 3.5x5.5", postally unused but short pencil message on reverse. Appears to be the DN-1 as it briefly flew on one engine, the other being removed to lighten airship. This is a historic card as the DN-1 was the USN's first airship. Text on front margin identifies this as an Underwood & Underwood image and states "Passed by Censor". Very good.