Subject: Re: Exhibition postmark ?

From: [email-masked] (SteveSwa)
Date: 24 Dec 1994 23:52:04 -0500

There is a CATALOG of EXHIBITION POSTMARKS by Bill Bomar.  It should be
available through the APS, or any other good philatelic library.

Naturally, most marks are collected on cover rather than loose stamp. 
Some years ago the fashion was to collect 2"x4" cuts from envelopes, but
that faded out, and stamps that way are worth little more than those
soaked.  Many exhibition cancels are quite rare, although many are common.
 You should also separate out those merely publicizing an exhibition to
those actually cancelled on the grounds.  The wavy lines are the killer
bars of the cancel, which often had space for a slogan.  The are always to
the right of the dial indicating town, date, and sometimes time.

Happy hunting.

Steve Washburne