“To dear Willie from his loving sister —Maria Antonia. — Christmas 1938”
Infanta Maria Antónia of Portugal (1903-1973) in a signed photo to her brother-in-law William Astor Chanler, Jr. (1904-2002).
Infanta Maria Antónia of Portugal married Sidney Ashley Chanler in 1934.
You can read more about the Infanta and her family here: https://eurohistoryjournal.blogspot.com/2019/06/the-portuguese-infanta-and-blue-blooded.html