Orel Hershiser -- I Still Rock My 1988 World Series Ring ... to Dinne -

It's been almost 25 years since Orel Hershiser fireballed the L.A. Dodgers past the Oakland A's in the 1988 World Series ... and this week, he reminded everyone of his former greatness by rocking his championship ring to dinner in Bev Hills.

Orel -- who's now part of ESPN's "Sunday Night Baseball" team -- was out at Madeo with friends this weekend ... when we noticed a large, shiny, blue object on his pitching hand.

Turns out, Orel still believes in showing off the goods in public ... 'cause the bling turned out to be his '88 ring ... and Orel was quick to flash it to the cameras.

On one hand, it's pretty badass ... on the other hand, it's a little Springsteen "Glory Days."