US Stamp 1975 Mint Sheet Scott #1571, Int'l Women's Year, 10c x 50 stamps, MNH, OG. The U.N. declared 1975 to be International Women’s Year in order to focus attention on the status of women in the world, to seek improvement in women’s human rights, and to encourage women’s political involvement. Worldwide Equality for Women. MAIL EARLY IN THE DAY. USE ZIP CODE. Catalog value $23.50.