What was the face value of the U. S. state flag stamp, issued as a sheet of 50 stamps on February 23, 1976, to commemorate the U. S. Bicentennial?

Culture Trivia Question: What was the face value of the U. S. state flag stamp, issued as a sheet of 50 stamps on February 23, 1976, to commemorate the U. S. Bicentennial?