The Piper J-4 Cub Coupe is a two seat, side-by-side version of the Piper J-3. The J-4 was produced by Piper Aircraft between 1938 and 1942 and is Piper’s first model with side-by-side seating. The fuselage of the J-4 is wider than the J-3 and the aircraft has a fully enclosed rear deck to the fuselage top. The seating arrangement combined with its docile low-speed handling, makes it a good training aircraft. The J-4 remained an excellent selling product for Piper until December 1941 when all civilian aircraft manufacture came to a stop when the United States entered into World War II.
The “Nicks Baby” artwork was selected by the owner and painted and signed by none other than Owen Willard Hughes. Mr. Hughes is a well known artist who is a WWII vet that also painted the Fuddy Duddy and Glacier Girl among others. https://nationalhomefrontproject.org/hughes-owen/