Graf Zeppelin Flown Verdol Oil Advertising Card - 1929

Interesting 3.5x5.5" card with text at the bottom front: "This card was brought from Germany on the Graf Zeppelin voyage ending August 4, 1929". The reverse left panel has details on this airship along with a statement that its motors used Verdol oils. The right panel urges readers to use Verdol oils. While this is of postcard size, it has no room for an address or message. Good, light dust.