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Convening Societies PIPEX 2017


Mobile Post Office Society

The Mobile Post Office Society (MPOS) was founded in 1950 by a group of philatelists interested in the study of United States Highway Post Offices. It soon expanded to focus on Railway Post Offices, and eventually to the enroute distribution and postmarking of mail all over the world. It is a nonprofit organization, affiliate #64 of the American Philatelic Society. Annual dues for membership in MPOS are $23/year for ordinary membership which includes a subscription to Transit Postmark Collector, the journal of MPOS which is currently in its 47th year of publication. Further information can be found the website.


Scouts on Stamps Society International (SOSSI)

The Scouts on Stamps Society International (SOSSI) is a nonprofit organization composed of international philatelists who specialize in philatelic material relating to the world-wide Scouting Movement. The purpose of the Society is to assemble information regarding Scout philatelic material that honors the Scout Movement and to promote interest in Scouts on stamps among stamp collectors and other interested individuals. SOSSI publishes the SOSSI Journal (six times a year). Membership in SOSSI is open to any person young or old who is interested in the Scouts on Stamps topic or thematic. For added information, please contact the SOSSI website: or the Acting Secretary: Lawrence E. Clay, PO Box 6228, Kennewick, WA 99336, USA or email:

The International Machine Cancel Society (IMCS)

Dedicated to the study of postal markings made by machines, the Machine Cancel Society has more than 300 members.  Rooted in the Flag Cancel Society, the name was changed in 1987 to reflect the Society's focus on all types of machine postmarks, both from the United States and elsewhere.  The Society publishes the Machine Cancel Forum quarterly, offers periodic auctions, and has published a variety of books, catalogs and monographs on machine-made postal markings of many different types.  Dues are $15 a year.  Visit us online at our website or on Facebook.

Women Exhibitors
Women Exhibitors (WE) - Regional Meeting

Women Exhibitors (WE) was organized in 2007 to provide a vehicle through which women exhibitors can encourage each other through sharing information, ideas, experience, advice, problems and solutions. WE has low membership fees to encourage newcomers to exhibiting and sponsors the Sterling Achievement Award for local, regional and WSP shows to serve as an encouragement to promising exhibits that have been awarded a silver medal or below. Continuing exhibitors serve as mentors and lend support to all as they share lessons learned in the wide world of exhibiting. WE provides a quarterly newsletter and holds a philatelic symposium (WE Fest) every two years at various WSP exhibitions throughout the country. WE membership is open to all, but philately is explored from a women’s point of view. WE are thrilled to be at PIPEX and look forward to meeting new philatelic friends. For more information, stop by our booth or on the website.


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