Mariners to Wear Seattle Steelheads Uniforms May 16 vs. Boston, by Mariners PR

Seattle Mariners (@Mariners) / X

Red Sox, Nationals, A's among MLB teams commemorating Juneteenth

Seattle Mariners on X: ICYMI, #Mariners will wear 1946 Steelheads

Mariners' Austin Jackson starts his rehab work in Tacoma

The Mariners are these wearing throwback uniforms vs the Rays

Mariners to honor Negro League Seattle Steelheads in May 16 game

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

The Mariners are these wearing throwback uniforms vs the Rays

Mariners pay homage to club's history with new City Connect

Royals, Mariners show off futuristic jerseys in “Turn Ahead the

The Mariners are these wearing throwback uniforms vs the Rays

Ortiz, Sandoval power Red Sox past King Felix, Mariners 4-2