Hi again,
I found a death record for a Mathilda Hein birth 23 Feb 1873 died 11 May 1940 in Alameda California. It lists her maiden name as Jacobsen. The Herman George Hein's mother was also a Jacobsen. I know the maiden name is not Alsen but with the dates being so close, it could be them. On the 1920 census, which has a date of 15 Jan 1920, Mathilda stated her age as 46. That would put her birth year in 1873 or 1974.
Both San Anselmo and Alameda are in the San Francisco area. Becky Jensen does research for Alameda County with the RAOGK site.
http://www.raogk.org/californ.htm
The 1904 date in my first post was not their marriage date but the year they immigrated to the US.