This one?

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The Supermarine Flag design appeared on design specification folders, and adorning the wall of the Executive Mess at Hursley Park, well into the 1950s … but when you look at the “official” publications it is the Vickers Armstrongs design that appears … and as Schneiderman also says in #4 … the interlocked VA and the “Spitfire” in script in post #15 would be the most appropriate for a Spitfire display since that was what appeared in the original brochures … though I suspect most Supermariners would have gone with “their” logo of the flag.