John, The Arrowhead was only open from about 1932 and gambling shut down in 1937. The place ran on after that for entertainment and dances, but the glory days were 1932-1937. The guy I got this postcard from worked as a cook at the Arrowhead. He told me that when they got word of a raid they would hide money and chips in garbage cans covered with vegetable trimings. He knew the Nasons as an employee. My guess the postcard is from about 1933.