It’s just your standard mid-WWII US Navy tri-color/tri-tone paint scheme – sea blue, intermediate blue, and white. This one has the early application, with the lower surfaces of the outboard wings painted intermediate blue – a later version of the tri-color scheme had the lower surfaces of the outboard wings painted sea blue, just the same as the top surfaces (as applied to the Texas Flying Legends FG-1D).

As Paul linked to, the example you have shown a photo of is one of only two original Royal New Zealand Air Force FG-1D’s flying today (the other being N43FG), and this one has been flying/operating from New Zealand for about 10 years now, and was operated in the UK throughout the 90’s, up until the early 2000’s when it was shipped to New Zealand.