Only two thoughts come to mind...a worker bee forgot to stamp it and it came to the US in a lot with other AE Lugers and was overlooked...or it was sold as a novelty item in Europe (surely someone across the puddle with sufficient disposable income wanted an AE just to be the only kid on the block that had one) and therefore it didn't require the export stamp.
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If it's made after 1918...it's a reproduction
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