Happy birthday to #Mets legend, Jerry Koosman!

Jerry Koosman- Mets All Time Lefthander (Part Three 1974-1985)

Memories still fresh as Mets celebrate 1969 World Series title's 50th anniversary

Jerry Koosman number retirement set for June 13 - Amazin' Avenue

Mets announce Jerry Koosman number retirement date –

Jerry Koosman: NY Mets legend on jersey retirement, World Series

Ultimate Mets Database - Jerry Koosman

Happy Birthday Jerry Koosman - The Mets Police

Mack's Mets: 2020

Jerry Koosman: NY Mets legend on jersey retirement, World Series

Happy Birthday to Mets legend Jerry Koosman!

April 23, 1969: Jerry Koosman gets his first win in Mets' miracle season – Society for American Baseball Research