Mariners to Wear Seattle Steelheads Uniforms May 16 vs. Boston

History:  The West Coast Baseball Association was an attempt at a western Negro League competitor, but it only lasted one season. The Seattle entry in the league was actually Abe Saperstein's Harlem Globetrotter baseball team under a new name, that of a local variety of salmon.

Ebbets Field Flannels Seattle Steelheads 1946 Home Jersey

Mariners, Cardinals to wear 1984 throwbacks

Wayback Machine: A legacy of black baseball - Sportspress Northwest

The Mariners are these wearing throwback uniforms vs the Rays today to honor the Seattle Steelheads, a former Negro League team : r/baseball

Seattle Steelheads Jersey Julio Rodriguez Negro Leagues Seattle Mariners

Mariners celebrate Juneteenth by honoring those pioneers who blazed a trail 75 years ago

Mariners Game Notes — June 17 vs. Chicago-AL, by Mariners PR

Mariners win on walk off in 10th inning vs. Rays

Mariners, Red Sox to Wear Negro League Uniforms – SportsLogos.Net News

Mariners, Red Sox to Wear Negro League Uniforms – SportsLogos.Net News

Bill Withers, Fred Brown

Seattle Mariners unveil new spring training uniforms