Jerry Koosman's No. 36 to Be Retired By Mets in June – NBC New York
New York Mets Collecting Guide, Tickets, Jerseys
Lot Detail - 1976 Jerry Koosman Game Used & Signed New York
New York Mets Collecting Guide, Tickets, Jerseys
New York Mets Collecting Guide, Tickets, Jerseys
PSA Magazine: 2023 April #016 by PSA Magazine - Issuu
PSA Magazine: 2023 February #014 by PSA Magazine - Issuu
New York Mets Collecting Guide, Tickets, Jerseys
New York Mets Collecting Guide, Tickets, Jerseys
PSA Magazine: 2023 February #014 by PSA Magazine - Issuu
New York Mets Collecting Guide, Tickets, Jerseys