[Air mail postcard addressed to William E. Boeing, Seattle, Washington, from Des Moines Post Office, Iowa, August 10, 1928]

Air mail postcard addressed to William E. Boeing, Seattle, Washington, from the Des Moines Post Office, Iowa, August 10, 1928. Text reads: "Congratulations - Des Moines, IA today dispatched more than 40,000 pieces of air mail via Boeing planes for a new worlds record. From the Postmaster Supervisors and Postal Employees of the Des Moines Iowa Post Office."