Membership Chairman Jaime Marckwordt won a Vermeil at StampShow 2004 for his one-frame exhibit Guatemala:  The Quetzal Air Mails of 1935-1939.  These stamps were designed by his grandfather, Carlos Marckwordt.

A selection of Guatemalan Postmarks, 1871-1902, prepared for the European Academy of Philately's June 2005 show in Bern, Switzerland, by Cécile Gruson.

A Society Exhibit for the Washington 2006 Stampshow.  Prepared by members of the ISGC, David Jickling, coordinator.