Its Old Timer Triple Header ... what MLB player was I?

[doc mercer]

I had over 270 career home runs

I played in the big leagues for 14 seasons

I played in One All Star game

I have a World Series Championship ring

I am the only player of this franchise to achieve this unique feat in a game

I played for 5 different teams

I had 7 seasons with at least 20 home runs

[Old-Timer]

I am the only player of this franchise to achieve this unique feat in a game
The only Twin to hit an inside the park grand slam.

Tom Brunansky.. Good One.