Fittingly, this sextet begins with the Expos in 1969 and ends with the franchise's change to the Nationals in 2005! There are four other notable debuts in between.
Montreal Expos: 4/14/69, stub, GD with staple mark.
Seattle Mariners: 4/6/77, full "souvenir" ticket with blank back, NM.
Florida Marlins: 4/5/93, full ticket, NM except for "X" notation on reverse.
Colorado Rockies: 4/9/93, full ticket, NM, protected inside screw-down lucite holder as a Rocky Mountain News commemorative piece.
Tampa Bay Devil Rays: 3/31/98, full die-cut ticket, NM, accompanied by limited-edition ticket holder and game program.
Washington Nationals: 4/4/05, full ticket, EX-MT.