Zeppelin Flight. 1924-25, 11 covers, including 3 German North America Flight of October 12-15, 1924, two cancelled Friedrichshafen, one - Stuttgart, two covers from US Flights to Bermuda of February 21-22 and April 21-22, Bermuda to US Flight 3 covers - two with different confirmation markings and one without it, US Flights to and from Puerto Rico 3 covers - one for direct and two for return flight (normal mail from San Juan or Air Mail Service of Mayagüez cancellation), mostly VF, Sieger #20a, b, 20M/V, €995++, Est. $600-$800 (Image)