Mets randomly announced they will retire Jerry Koosman's number 36

Remembering Mets History (1973): Jerry Koosman Wins April NL Pitcher of the Month

New York Mets - 📅 The date is set! 📅 We will retire Jerry Koosman's No. 3⃣6⃣ on Saturday, June 13 in a pre-game ceremony. 🎟️👉

Mets to retire Jerry Koosman's No. 36 next year - Newsday

Jerry Koosman Jersey Retirement Ceremony, Watch live as we retire Jerry Koosman's number 36., By New York Mets

New York Mets - Wikipedia

Tom Seaver - Wikipedia

Mets News: Mets to retire Jerry Koosman's number 36 in 2020. - Amazin' Avenue

Mets retire Jerry Koosman's No. 36 'This is your home, and this is your family'

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

Mets to Retire Jerry Koosman's Jersey - The New York Times

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