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

Mariners should replace their Sunday cream jerseys with throwback white trident jerseys for the new Era (don't mind the poor photoshop) : r/Mariners

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

MLB and MiLB Teams Plan Throwbacks for Juneteenth

Here's a look at the Mariners' new City Connect uniforms and the story behind them

Mariners debut latest City Connect uniforms

Baseball: Mariners Cap Off Successful Homestand, Take Series from White Sox – Eli Sports Network

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 today to honor the Seattle Steelheads, a former Negro League team : r/baseball

Seattle Mariners on X: These jerseys 😍 #GoSteelheads / X

Mariners, Cardinals to wear 1984 throwbacks