It happens. From time to time people goof up and I certainly goofed on the Stranrayer Roundel. Mel informed me this morning that the Roundel was actually taken from a Black Shark, donated by Dean Chalcraft in 1994. Mea Culpa.
My knowledge of WWI aircraft is not great so I had to ask Mel what a Black Shark was. His reply:
The Blackburn shark was a torpedo bomber used in WW2 on both coasts as well as Trenton
It flew with most of the Bomber Reconnaissance Squadrons here on the West Coast.
You can see the Roundel under the wing on the right: