I have Martin's birthday as July 14, 1877 in Norrick, Norway.
I have found though that it's not uncommon for birthdays to vary slightly over time during that period, so I'm not sure.
I had seen the record for Martin Davidson married to Signe.
I'm not sure how to verify it. I think that if Signe and Martin were married prior to 1912 or if there was record of that Martin in the US prior to 1912 then that would pretty much make any connection impossible, but then, unless I found the Norwegian Parish records I wouldn't know really when they had married.
I will keep looking and appreciate your help!