FNorm,
The hold open device was a feature of Luger from the beginning. It was eliminated for the 1908 army contract, but quickly reinstated in 1913 when it was realized that it was false economy to eliminate it as it served a very useful function. Except for the early Navy Lugers, carbines and some prototype examples, the stock lug also did not appear until 1913 (it was another thing eliminated for the 1908 army contract).
Your solution for snap caps seems to be the only option as 9mm versions abound but I have not been able to locate commercially available 7.65mm Luger snap caps.
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If it's made after 1918...it's a reproduction
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