[Marsupial]

Notice how there's a big dot, and a small dot, on every lines.

I guess there 4 lines, numbered 1, 2, 3 & 4, each with one value that has one decimal: 7.2, 5.0, 3.3, 2.5.
My guess is some shortwave bands reference. Perhaps during the war to get news from Europe? (although international SW Bands are 11m and up. but I don't know how they are related to on the dial for that specific radio. Maybe it doesn't make sense)

Values 2 & 4 have been checked out. Owner was still trying out on 1 & 3... maybe?