Marion is listed as unmarried in her mother's will in 1915. She and Walter are not listed together except for the following trip [maybe their honeymoon] and the 1930 Greenwich, Connecticut, census.

Marion Potter, born Townsend, is listed along with Walter on this trip.
New York, Passenger and Crew Lists (including Castle Garden and Ellis Island)
Name: Walter Armington Potter
Arrival date: 22 Feb 1926
Birth Date: 8 Apr 1865
Birth Location: Rhode Island
Birth Location Other: Providence
Age: 60
Gender: Male
Port of Departure: West Indies
Port of Arrival: New York, New York
Ship Name: California

Lived for many years at the Hotel Lincolnshire in Boston.

Boston Daily Record, Friday, Oct 4 1957, p. 5:
Multi-Million Will Bars Financing of 'Propaganda':
Mrs. Marion S. Potter, left money to charitable, educational, medical, and humane organizations, mostly in Rochester, New Hampshire, and Boston area. Also personal amounts to relatives and friends. Her stipulation was that no part of the income of such organizations is paid to any stockholder or individual. No substantial part of its activities is devoted to propaganda or to influence legislation. Organizations and persons are named in this article.

Marion is listed as unmarried in her mother's will in 1915. She and Walter are not listed together except for the following trip [maybe their honeymoon] and the 1930 Greenwich, Connecticut, census.

Marion Potter, born Townsend, is listed along with Walter on this trip.
New York, Passenger and Crew Lists (including Castle Garden and Ellis Island)
Name: Walter Armington Potter
Arrival date: 22 Feb 1926
Birth Date: 8 Apr 1865
Birth Location: Rhode Island
Birth Location Other: Providence
Age: 60
Gender: Male
Port of Departure: West Indies
Port of Arrival: New York, New York
Ship Name: California

Lived for many years at the Hotel Lincolnshire in Boston.

Boston Daily Record, Friday, Oct 4 1957, p. 5:
Multi-Million Will Bars Financing of 'Propaganda':
Mrs. Marion S. Potter, left money to charitable, educational, medical, and humane organizations, mostly in Rochester, New Hampshire, and Boston area. Also personal amounts to relatives and friends. Her stipulation was that no part of the income of such organizations is paid to any stockholder or individual. No substantial part of its activities is devoted to propaganda or to influence legislation. Organizations and persons are named in this article.