JRM 61b: 1948 Four Color Background

The JRM 61: 1948 Four Color Background series is yet another featuring patterns of colors behind the players (this time, with a variety of options, thin pinwheels, zigzags, etc.), and also comes in a few different sizes. JRM61b are the cards that are 2 5/8" in diameter, with at least 2 known at this size.