The jersey does say Alaska airlines on the back at the top.
Here's the story behind the Mariners' amazing sleeveless jerseys
Seattle Mariners MLB BASEBALL SUPER VINTAGE True Fan Size XL Baseball Jersey!
Seattle Mariners MLB BASEBALL SUPER VINTAGE True Fan Size XL Baseball Jersey!
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Seattle Mariners SGA Alaska Airlines Retro Jersey Size XL 7/24/21 Seattle Pilots
The jersey does say Alaska airlines on the back at the top.
Seattle Mariners SGA Retro Jersey SGA Size XL 7/24/21 Pilots
Official Vintage Mariners Clothing, Throwback Seattle Mariners Gear, Mariners Vintage Collection