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Over on the IPMS Uruguay board is a magnificent 40+ page thread on shark mouth decorated aircraft. It's a well known, well-worn topic, but this picture selection is a magnificent achievement with a much wider range than the usual 'Flying Tiger' P-40s.
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As is well known now, the AVG P-40s copied 112 Squadron RAF (and other, including RAAF Desert Air Force Kittyhawks) who themselves had copied the German's Messerschmitt Bf 110 fighters, as seen here:
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Better still is a selection of other related aircraft decorations such as a Medusa head (what an interesting idea) from this post ...
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... and a few odd items like our amusing heading image. (it's from this post, and the translated note says: "And thanks to the collaboration with Domingo, I present the father of them all, the Me 262.")
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For those interested in finding something a it more specific rather than a general browse, there's a listing by page in this post.
James