20th Century Popular Songs

A very uncommon series of four interlocking cardboard jigsaw puzzles, of unknown manufacturing origin, all featuring popular songs of the WWII era.
The 204-piece count of each puzzle is similar to that of several major manufacturers of the era, such as Lumar and Welcom. See Lama's Palace, Tibet , a very similarly proportioned 204 piece example from the latter company.
Each puzzle is housed in a very stylish piano-shaped box with smaller scale colour guide image.
So far I have only personally encountered one of these rare puzzles, that of number 3, "Roll Out the Barrel", but I have seen details of a second, that of "Wings Over the Navy".