I have found neither birth for death records.
Several census records have middle initial as 'C' but stone has 'D'.
Birth record on 1900 census has Aug 1857.
Colin Chatfield Oct 2014.
-----
Find A Grave Memorial# 105140728
=====
USA Census, 1900
Name: Harriet C Preston
Event Place: Borough of Brooklyn, Election District 13 New York City Ward 20, Kings, New York
Gender: Female
Age: 43
Marital Status: Married
Race: White
Relationship to Head of Household: Wife
Number of Living Children: 0
Years Married: 4
Birth Date: Aug 1857
Birthplace: New York
Marriage Year (Estimated): 1896
Father's Birthplace: New York
Mother's Birthplace: Connecticut
Mother of how many children: 0
Household Role Gender Age Birthplace
Henry Preston Head M 53 Connecticut
Harriet C Preston Wife F 43 New York
Annie L Preston Daughter F 24 New York
Pat K Flaherty Boarder M 47 New York
Mary Shannon Boarder F 30 Ireland
Maggie Lavin Boarder F 28 Ireland
District: 317 , Sheet Number and Letter: 9B , Household ID: 221 , Line Number: 53 , Affiliate Name: The U.S. National Archives and Records Administration (NARA) , Affiliate Publication Number: T623 , GS Film Number: 1241057 , Digital Folder Number: 004114550 , Image Number: 00488
-----
USA Census, 1910
Name: Harriet C Preston
Event Place: Brooklyn Ward 20, Kings, New York
Gender: Female
Age: 52
Marital Status: Married
Race: White
Relationship to Head of Household: Wife
Birth Year (Estimated): 1858
Birthplace: New York
Father's Birthplace: New York
Mother's Birthplace: Connecticut
Household Role Gender Age Birthplace
Henry G Preston Head M 62 Connecticut
Harriet C Preston Wife F 52 New York
Anna Nee Servant F 22 New York
Kate Gilsen Servant F 27 Ireland
District: 473 , Sheet Number and Letter: 1A , Household ID: 8 , Affiliate Name: The U.S. National Archives and Records Administration (NARA) , Affiliate Publication Number: M1283 , GS Film number: 1374983 , Digital Folder Number: 004449895 , Image Number: 00540
Records not imported into INDI (individual) Gramps ID I34159:
Tag recognized but not supported Line 1098292: 2 _SCBK Y
Tag recognized but not supported Line 1098294: 2 _TYPE PHOTO
Tag recognized but not supported Line 1098295: 2 _SSHOW Y