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Re: Is this from an aircraft?
Then I doubt the box would have been on a B-17. B-17 parts would have been made to inches/feet standards not metric. So assuming the rivets are "exactly" 3 cm apart rather than say "exactly" 1 and 1/4 inches apart, I think the box was made using metric standards. There may be some other items or dimensions on the box that you could measure both ways to see if you get similar results.
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