Curt Flood Signed Official National League Baseball – St. Louis Cardinals Star & Baseball Labor Pioneer – JSA LOA (Greenshields Collection)

Official National League baseball signed by Curt Flood, one of the most historically significant figures in professional baseball history.

The baseball features a bold blue ink signature prominently positioned on the sweet spot, creating an excellent display example from one of the most influential players in the evolution of Major League Baseball.

The autograph was submitted to James Spence Authentication (JSA) during the 2026 Montreal Expo and has successfully passed authentication. The official JSA Full Letter of Authenticity (LOA) is currently being processed and will be provided to the winning bidder once received.

A standout center fielder for the St. Louis Cardinals, Flood was a three-time All-Star, seven-time Gold Glove Award winner, and key contributor to the Cardinals’ championship teams of the 1960s. While accomplished on the field, Flood’s greatest impact came through his historic challenge of Major League Baseball’s reserve clause system, a landmark battle that helped pave the way for modern free agency and permanently changed professional sports.

Due to his unique place in baseball history, Curt Flood signed memorabilia remains highly collectible among both baseball enthusiasts and collectors focused on historically significant sports figures.

Authentication & Provenance
James Spence Authentication (JSA) – Autograph Passed Authentication
Full Letter of Authenticity (LOA) in progress and will be shipped to winning bidder

This piece originates from the esteemed Greenshields Collection, a significant and carefully assembled lifetime baseball memorabilia collection built over decades. The collection features signed memorabilia, game-used equipment, and historic baseball collectibles, with items noted for their quality, consistency, and strong collector appeal.

Condition
The baseball displays moderate toning, handling wear, and age-related discoloration consistent with long-term storage and display. The blue ink signature remains bold, highly legible, and presents exceptionally well on the sweet spot. Overall presentation is strong with excellent display appeal. Please refer to photographs for complete condition details.

Details
Item: Single-Signed Official National League Baseball
Signer: Curt Flood
Team Association: St. Louis Cardinals
Signature Location: Sweet Spot
Autograph Authentication: JSA Passed Authentication – Full LOA In Progress
Display Case: Included
Provenance: Greenshields Collection