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The backrest cushion was black leather in all Spitfires. I'm not sure whether the Mk.22 had a bakelite seat or not. If you decide it did, the only visible bakelite was the seat pan and the portion of the back that was not covered by the cushion. The outside and bottom had a metal support which was the usual cockpit green. If the seat was metal, of course it would be overall green apart from the cushion.
here is a quote from the spitfire forums about the seats:
"It's a common misconception that the plastic seat replaced the metal; it didn't, in fact mod 189 stated, specifically," To introduce the plastic seat as alternative design to assist production and provide alternative manufacture," and it was incorporated onto the production line from May 14th., 1940.
19-41-42, mod 522 was "To strengthen plastic seat." (this is the metal 'bucket' referred to)
In 1945, mod 1117 "To strengthen seat to enable "Q" type harness to be embodied" had the added note "4B essential on fitment of mod 922 if pilot's seat is metal or plastic and has a wall thickness of less than .15" " This seems to indicate the metal seat stayed in production, throughout, in fact I have found drawings, in the RAF Museum library, for metal seats in the Spitfire and Seafire, with post-war mods added to them.
Incidentally, mod 922 was for the introduction of the "QK" harness, which was still a Sutton, not, as so many believe, one with a quick-release parachute-type box; that was the "QS," which came in August 1946.
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