Here's a transcription of Mary's death cert giving date of birth.

name: Mary A. Spuhler
gender: Female
burial date: 24 Oct 1912
burial place: Cherokee, Iowa
death date: 19 Oct 1912
death place: Spencer
age: 61
birth date: 11 May 1851
birthplace: England
occupation: Housewife
marital status: Married
father's name: S. Digby
father's birthplace: England
mother's name: S.
indexing project (batch) number: B86825-4
system origin: Iowa-EASy
source film number: 1412250



groom's name: Frederick Spuhler
groom's birth date: 1863
groom's age: 24
bride's name: Mary Mallory Digby
bride's birth date: 1850
bride's age: 37
marriage date: 17 Sep 1887
marriage place: Cherokee, Cherokee, Iowa
groom's father's name: Peter Spuhler
groom's mother's name: S. Theresten
bride's father's name: Abe Digby
bride's mother's name: S. Crampton
indexing project (batch) number: I10291-0
system origin: Iowa-EASy
source film number: 1035292

The above is the date of the marriage license...they were married 24 September from another record.

groom's name: Amasa W. Adams
groom's birth date: 1882
groom's birthplace: Marshalltown, Ind.
groom's age: 22
bride's name: Jennie May Spahler
bride's birth date: 1885
bride's birthplace: Arelia, Iowa
bride's age: 19
marriage date: 11 Mar 1904
marriage place: Spencer, Clay, Iowa
groom's father's name: Fred Samuel Adams
groom's mother's name: Maggie Richardson
bride's father's name: Fred Spahler
bride's mother's name: Mary Digby
groom's race: White
groom's marital status: Single
bride's race: White
bride's marital status: Single
indexing project (batch) number: M02597-1
system origin: Iowa-EASy
source film number: 1435879