LOCK SEALS. LOCK SEALS: 90-91: ORANGE with black Control and Series B and GREEN with red Control and Series L, Lithographed on Medium Wove paper, Rouletted 7, Straight "Series" with letter, no lower number or position number, both in GUTTER TAB strips of 10 (2x5), fresh and very fine. (Priced in 1986 American Revenuer at $1250) (Image)