I recently found a CAP Base 14 history book. The book itself is great. One of the pictures is a CAP Aircraft with a bomb laying on the ground. The bomb on the ground looks like it has a Swastika painted on the bomb.
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You see a swastika, I see the number 4....
I gotta go with Jim on this - it's a swastika.
It looks similar to the ordnance that's been dropped elsewhere and elsewhen that shows disdain for the recipients.
And I do acknowledge that your response was likely tongue-in-cheek. :)
An enlarged version of the picture.
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Could be a swastika, which wouldn't surprise me. Or it could be some driftwood. :D