Main differences were '04: grip safety,no stock lug, long frame; '08: no grip safety, stock lug, short frame.
.30 Luger came first, 9mm later, I think around 1906. The Swiss bought .30's, and usually commercials were .30's. 9mm tested by US Army, and commonly German military. It depended, though on which market/contract they were being produced for, not on date/time, as you suggest.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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