Fatto generale: 1261 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fatto matematico: 1261 is a Hexanacci-like number starting from 1, 1, 1, 1, 1, and 1.
Trivia: 1261 is an uninteresting number.
Data storica: June 14th is the day in 1937 that Pennsylvania becomes the first (and only) state of the United States to celebrate Flag Day officially as a state holiday.