Social organizations, such as the Lions Club and Rotary International, have also formed stamp collecting groups specific to those stamps that are issued from many countries worldwide where the organization's logo exists.
Air Mail rotary set: refers to the 1995 series from Panama issued to mark the 50th anniversary of the founding of Rotary international.
Air Mail Semi-Official Stamp: privately printed stamps used for private flights in balloons or planes.
 See also: Hinge, Label, Single, Machin, Grill
  
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