I don't know when the Premium was released. However, when the photo was taken for the this Premium.... I can slightly help!
Jersey & Billboard ads are the key.
As you mention jersey elimination would be kinda tough.
1950 would be the only "1950s" and don't believe that's it. So...thinking it's late 1940's
Based on the Alphen Brau "COLD", "Sealy" & Philip Morris ad...shown
I think the answer maybe 1947. I don't know if this user has the correct year or not, but at least you can more of the Falstaff ad instead of just the bottom to help pin point.
https://www.flickr.com/photos/crawfordbrian/38228993034