St. Louis Cardinals at Baltimore Orioles

The Orioles wore throwbacks commemorating 60 years since they moved to Baltimore.

Baltimore Orioles at Pittsburgh Pirates

The Orioles and the Pirates celebrated the 40th anniversary of the teams' 1971 World Series appearance.

Baltimore Orioles at Tampa Bay Rays

The Orioles wore all-orange, which they wore twice in 1971, while the Rays dressed as the minor league Tampa Tarpons of the mid-1970s.

Note: Special thanks to Thomas, who submitted this on the comments page, I had had the wrong date, it is corrected to August 13.

Baltimore Orioles at Kansas City Royals

The visiting Baltimore Orioles dressed as the 1950s Baltimore Elite Giants and the Royals were dressed as the 1949 Kansas City Monarchs as the teams played in an annual Negro League tribute game. Billy Butler's two-run home run in the eighth inning was the difference as the Royals won 4-3.

Washington Nationals at Baltimore Orioles

The Orioles, honoring the 30th anniversary of their 1970 World Series championship, defeated the Nationals, who were dressed as the 1963-71 expansion Senators who would later become the Texas Rangers. Before the game Earl Weaver was "thrown out" of the game as he accompained interim manager Juan Samuel to home plate with the lineup card.

Baltimore Orioles at St. Louis Cardinals

Baltimore Orioles at Tampa Bay Devil Rays

The Devil Rays wore the uniforms of the FSL St. Petersburg Saints from 1965, while the Orioles were wearing uniforms from the late 1960s.