This silver plaque commemorates "The Flight of the Bremen", which was the first successful East-West transatlantic flight to be made.
The first transatlantic flights were made in a West-East direction, but the severe winds and greater flight time made the flight from Europe to North America far more dangerous. There were ten unsuccessful East-West transatlantic attempts in which seven lives were lost. This achievement was finally made in April of 1928, when the Bremen, piloted by Koehl, Von Hunefeld, and Fitzmaurice departed from Baldonnel Aerodrome on Thursday 12th April 1928 and landed on Greenly Island in Labrador the following day.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.