Deborah Friedman Collection of Colombian Airmail; U.S. & Worldwide Stamps
November 7, 2007 and November 13-15, 2007
LIBERIA Air Post
1952 25c and 50c, group of four sheets of 20 incl. two overprinted Specimen, also 25c imperf. sheet with wrong colors (of 50c), plus 50c sheet with center omitted, n.h., v.f.