Balance of the 1919 Issue. Large group of seals and 22 covers on exhibit pages, range of varieties of the different types as recorded by Kotanchik (1919-1950), including paper types, perforation types, watermarks, etc., highlights include OX20c watermarked Eagle and Star pane of 20, OX27 block of four, covers range from 1919 to 1950 and include OX21d on cover, OX21 combo use with Indian seals on cover from U.S. to Tannu Tuva, OX21 combo use with German seals on incoming cover, OX21 on, OX21 RPO use (1 of 2 recorded), OX22 incoming from British Guiana, OX23 10 seals on plane crash cover, two OX28 usages including the EKU, OX29 on cover from Uruguay, OX30 APO use, etc., OX33A use (two of the three recorded examples of this seal), etc, F.-V.F., a remarkable study of this issue that would be difficult to duplicate. Scott No. OX21-OX39  Estimate $1,000 - 1,500. $0 (Image)