Remembering Mets History (1973): Jerry Koosman Wins April NL Pitcher of the Month
Jerry Koosman Autographs, Memorabilia & Collectibles
ORIGINAL 1994 SPECTRUM SERIES. Autograph has been certified authentic by Beckett Authentication (BAS).
JERRY KOOSMAN SIGNED 1969 NEW YORK METS 1994 SPECTRUM #4 BECKETT
Jerry Koosman New York Mets Original Sports Autographed Items for sale
Jerry Koosman: NY Mets legend on jersey retirement, World Series
Honoring Keith Hernandez's No. 17 jersey retirement with 17 stories of the Mets lifer - The Athletic
1969 Mets Pitchers 16x20 Photo Signed by (4) With Tom Seaver, Jerry Koosman, Nolan Ryan & Gary Gentry (FSC COA & Ryan Hologram)
Jerry Koosman MLB Original Autographed Items for sale
Keith Hernandez still in awe ahead of Mets jersey retirement
Jerry Koosman Autographed Jersey - Mets History
Remembering Mets History (1973) Jerry Koosman Shuts Out the Giants for Ten Innings In a 1-0 Win