"Times Square, known throughout the world as 'The Great White Way' is the magnet and high spot of New York. Here millions of people seek entertainment in the many theaters, night clubs, restaurants, etc."

Even without a stamp or postmark, the presence of Charlie Chaplin's The Little Dictator and Gary Cooper in The Westerner place this uh, squarely in 1940. The play Life With Father would already have been running since 1939. (Thanks, Wikipedia.)

Enlarged to show detail.