[Mmcar]

I just picked this postcard up. I thought the photo was neat evan though i don’t know much about it. Can anyone help identify if these are professional players in the photo or just a random picture. I’m guessing the postcard may be from the 1920’s to 30’s by the stamp on the back but i may be wrong on that. Any help would be appreciated. I don’t have much knowledge with postcards. Thanks in advance.