Swartz Ink Products-Royal 490, 590, 591, 690, 700, 770, 870, 890, 970, 971, 972, 973, 990 and 991 Typewriter Ribbon, Compatible, Black, Twin Spool 9/16" Ribbon Black Nylon 2" Spool Swartz Ink Products Ribbon Replaces Nu-kote Part #B67 and Royal Part #104