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The cowling lip exhaust collector is common to he whole Bristol family of engines. Same on The Sunderland, Beaufort, Beaufighter, Halifax (round motored ones of course) and also PZL 23, 37 et c.
It's copper/bronze plated steel and should be the colour of an old water pipe in service.
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I'm not making it up as I go along, I'm establishing precedent
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