Hard to believe it's been over 11 years plus since I conducted the Schermack Control Perfin Census. Perhaps some of you will remember, many probably do not. During that time we have lost many collectors.
Census information was made available in The United States Specialist and the Perfins Bulletin. Those articles are still available digitally through The United States Stamp Society and The Perfins Club websites.
Though the census was closed November 5th 2013, I continued to update data as more became available. That information can be found at Stampsmarter.org.
It's a very interesting subset to collect. New discoveries are still being found. Check them out. Welcome any comments, questions or observations.
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