Since al the men are wearing hats, it is most likely from the 30s or 40s. Could be as late as the mid-50s. When I was growing up, no one ever went outside without a hat – men, women, children. Always had to have a hat on your head. Then, all of a sudden, men stopped wearing hats. Many wore baseball caps, but you rarely see a man wearing a hat these days. Don’t know why they changed. Most of those guys look pretty fetching in their chapeaux!