Based in Oakland , California , they played their home games at the Oakland -- Alameda County Coliseum Arena .
The Seals were one of six teams added to the league as part of the 1967 NHL expansion .
Based in Oakland , California , Seals played Seals ' home games at the Oakland -- Alameda County Coliseum Arena .
The Seals were one of six teams added to the league as part of the 1967 NHL expansion .