I photographed these Cessna 310 examples in Washington, Oregon, Wisconsin and Florida. The one at the Olympic Flight Museum is painted to represent a U-3 Blue Canoe in Navy markings.
1960 Cessna 310D #39102
Arlington airport 2022
Cessna 310 #35752
Olympic Flight Museum 2018
1963 Cessna 310H #310H-0134
Paine Field 2013
1955 Cessna 310 #35150
Some search mention U-3/L-27 Blue Canoe