It is a MODEL 1900, however if it is sn 128, I would expect that it was made in 1900. You have one of the first ones made, as there was a swiss contract and a commercial contract, so I can't say yours was the 128th made but close. "I don't like how the #128 looks" but I have only seen a few 3 digits.
It is obviously a commercial gun, because that is how they were sold.
You can buy a firing pin from someone, maybe Tom Heller, or on gunbroker.
Its a German Luger, and all were made in Germany (the swiss later made some too).
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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