Classic Mariners Games: April 2, 2007, by Mariners PR
Gaylord Perry, Hall of Fame Pitcher With a Doctoring Touch, Dies at 84 - The New York Times
Gaylord Perry - Wikipedia
Perry wins 300th game with Mariners
Gaylord Perry Baseball Stats by Baseball Almanac
1983 Topps Gaylord Perry Mariners Baseball Card #463 at 's Sports Collectibles Store
Your Cheating Heart Will Tell On You: A Seattle Mariners History - Lookout Landing
Gaylord Perry passes away
Perry wins 300th game with Mariners
Gaylord Perry – Society for American Baseball Research
Gaylord Perry, two-time Cy Young winner, dies at 84
You will receive the actual certificate described above. This certificate is from my dad's collection. I do not know if he really was in attendance or
GAYLORD PERRY ~ 300th Career Victory Certificate ~ Autographed/Signed ~Mariners
R.I.P. Gaylord Perry — Canadian Baseball Network