The Mariners, skippered by Bobby Floyd, had a roster that included a few future big leaguer M's.
Washington native Karl Best and battery mate Dave Valle would both go on to play in Seattle.
Perhaps the most interesting player with the club was Gary Pellant, who played the previous season in Alexandria.
On April 30, Pellant hit home runs from both sides of the plate in a single game.
Municipal Stadium at Four Mile Run Park served as the Mariners home ballpark.