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

Mariners Jersey Tracker (@MarinersJerseys) / X

Seattle Mariners' Dustin Ackley batting against the Boston Red Sox in a baseball game on Saturday, May 16, 2015, in Seattle. Both teams are wearing uniforms of Negro League teams of 1946

Seattle Steelheads 1946 Home Jersey – Ebbets Field Flannels

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

M's fall to Bosox, King Felix takes 1st loss

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

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

LEADING OFF: Juneteenth around MLB and Father's Day

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Julio Rodriguez Game Used Seattle Steelheads Uniform - 6/17/23

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