The 9mm was not introduced until the 1902 model around serial number 22,000. Your 1900 American Eagle was intended for the US market and was in 7.65mm. Finding a replacement barrel may be difficult since the 1900 had the "long frame" and a later model barrel will not fit. Perhaps a good used barrel might be found.
The lack of proof marks and "GERMANY" export marking would make your Luger one of the so called "out of range" examples which may or may not have been one of the US Test series.
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If it's made after 1918...it's a reproduction
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