[Curtiss NBS-1 (Martin MB-2) in flight]

Photograph of a Curtiss NBS-1 (Martin MB-2) aircraft (fuselage number 46) flying near a pylon at the 1923 Pulitzer Air Race in St. Louis, Missouri, October 1923.

Inscription: "B-11188 A.S."

Inscription on verso: "Martin MB-2/NBS-1. 1923 St. Louis."

Stamped on verso: "Official photograph. Property of U.S. Army Air Service. Reproduction of this photograph is prohibited except when and as authorized in writing by the Chief of Air Service, Washington, D.C."