At the top front: 210 - Aerial view of main Avenue Bridge and Downtown Cleveland, Ohio Bottom left: Butler Airphotos, Inc, Bottom right: 9A-H1932
On the Reverse: The Main Avenue Bridge, 5920 feet in length, spans the Cuyahoga River which empties into Lake Erie at this point. The Downtown of Cleveland is shown in the background, with the Terminal Tower rising above the other buildings. Side Right: The Union news Co. Middle: C.T. Art-colortone Reg. U.S. Pat. Off. POST CARD Upper Right: PLACE ONE CENT STAMP HERE.
If I were to guess, I would go with the "1932" number on the front?