EARLY TO MIDDLE PERIOD ERRORS, VARIETIES, SPECIMENS, COVERS, ETC: Range of more unusual items & covers on stock cards. Includes 1890 20c ultramarine SG O41 (Maxwell O5c) block of 9 with overprint omitted, 1913 undenominated red Perkins Bacon Revenue issue imperf proof, 1938 'Anniversary of the Postal Service' mini sheets (2) each with error of colour varieties SG 999a/d var. & SG 999e/h var., 1983 4th Anniv. Revolution imperf. proof pair, etc. Lot also includes 3 x 1900s covers to Germany/US, 3 x 1912 covers to foreign destinations, etc. (c.82 stamps, 2 mini sheets & 8 covers) (Image)