This image shows the proscenium stage of the Festival Theatre in Stratford, Ontario, Canada. The venue hosts the world famous and long running Stratford Festival. It features Shakespeare plays and other popular subjects from the late Spring through early Fall.
Canadian Post Card Co., Ltd, Toronto
The description on the card states:
Auditorium and Stage of
THE FESTIVAL THEATRE
Stratford, Ontario, Canada
Seating 2258, the auditorium of this unique theatre is semicircular, built in arena style. Constructed at a cost of more than $2,000,000, its productions are annually seen by more than 250,000 people.
–The venue still exists and looks almost the same today. This card was used, and dates from the 1960s.