Re: Spitfire MkVb s/n en821
There is a photo in Fighter Squadrons of the Royal Air Force, page 345. The code letters are only slightly smaller than the roundel, so I suggest 30in. They begin just below the cockpit rail, and the width of the lower letter overlaps the wing fairing.
This aircraft has the pipe from the rear of the exhaust into the fuselage, for cockpit heating I believe.
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