The back of the last postcard show what looks like “Vic Larrey” on the right side. Found a hit to a Vic Larrey in an article from the Oakland Tribune, Sept 5, 1926. I don’t have a subscription unfort, but this came up in the google search:
The team as it Was made vp in those days read, left toVight: (Top) GENE VALLA, VIC LARREY, BILLY - WALLACE .... The Young Men's Institute
https://www.newspapers.com/newspage/90404694/