April 6, 1977: Angels debut their first free-agent class; Mariners open play in Seattle – Society for American Baseball Research

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1977 Seattle Mariners Inaugural Series Program

Seattle Mariners v California Angels Unocal 76 Pin #1 Opening Night 6 April 1977.

Unocal 76 Pin #1 Opening Night 6 April 1977 Seattle Mariners v California Angels

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1977 Seattle Mariners Inaugural Series Program

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Seattle Mariners play their first game, a 7-0 loss to the

1977 Seattle Mariners Inaugural Series Program

Seattle Mariners' young core is here to lead them now and in the