Magdeburg - Stemmler

Hello list: Im trying to find any info. for my Grt.Grandfather. He came to the Usa in 1884 and last German address just said Magdeburg Prussia Hannover.
His name was Curt Stemler and mother Emilie Weiss. Father has been shown as:
Charles Armin Stemmler. Parents never married. I have his birth as 8-14-1868.
He returned to visit in 1912 I beleive. Are there any birth or passport records available in this time. Thank You for any replys.

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** Nannette **
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