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Exchange club - Club whose members circulate material (usually individually priced in booklets), generally by post, but which does not normally arrange meetings of members.
Extension perf hole - Pattern of perforation in which each horizontal (rarely, ...
Extension perf hole: perforation pattern where row of perforations is extended by one hole into either or both margins.
Exterior: with Mercury design, inscription on stamps of Uruguay, parcel post.
 See also: Fiscal, Catalog, Army post office, Adhesive, Applied
  
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