Add this Game-Used Base vs. Seattle Mariners on June 12-14, 2026 - Third Base to your Washington Nationals memorabilia collection. Bearing authentic, in-game wear, this piece of official equipment was used during that matchup, offering fans a genuine example of live game action. This base was obtained under the auspices of the Major League Baseball Authentication Program and includes an individually numbered, tamper-evident hologram that can be verified online to certify its authenticity.