"I'm just happy that I'm not that old so I don't recognize that uniform," Johnson said when he saw the team's 1924 throwbacks before Thursday's game. "I think it looks good."
The Nationals and Giants paid homage to their 1924 clubs -- Washington was the Senators at the time, but also referred to as the Nationals -- by wearing retro jerseys, while the ballpark staff wore replica uniforms.
The club also had special offers on concessions, organ music throughout the game and video tributes to the 1924 club.
Johnson said it's a good opportunity to look back on the players he grew up admiring.
"I think the only person I can remember on that team was [Walter 'Big Train' Johnson], a fire-balling right-hander," Johnson said. "It'll be fun. All those old-timers were guys that I looked up to and followed their careers. It's going to be fun."