This is mostinteresting, because we also have an unexplained marriage involving Berlin. My husband's grandparents were students at the University in Berlin in 1897. They had moved from Warsaw. We have a marriage announcement card that says that they were married in Belin in June 1897.  We have an official wedding license from Geneva Switzerland with a date of September 8, 1897.  We have been unable to figure this out.  Any ideas?  
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Avivah R. Z. Pinski ,  near Philadelphia, USA