The first philatelic cachet souvenir was issued at Pittcon 1977 under the direction of Dr. Edwin S. Hodge, who served in 1959 as the President of the 10th Conference. The philatelic innovation was so well received that it was decided to prepare a different cachet and canceler for every Pittcon year, drawing attention to a special event, a particular branch of science, or certain key scientists. Below are the 30 Philatelic Cachet Souvenirs representing each year of Pittcon starting in 1977.

Simply click on the appropriate button to view the envelope and insert.

1977	1978
1979	1980
1981	1982
1983	1984
1985	1986
1987	1988
1989	1990
1991	1992
1993	1994
1995	1996
1997	1998
1999	2000
2001	2002
2003	2004
2005	2006
2007	2008