Oakland Athletics at Boston Red Sox

A's and Red Sox wore 1936 uniforms to continue the 100th year of Fenway Park celebrations and honor the years the teams traded Jimmie Foxx.

Pittsburgh Pirates at Oakland Athletics

The A's defeated the Pirates 5-0 on 1970s Turn Back the Clock night. Both teams wore flashy uniforms from the 70s, with the A's in bright yellow and green and the Pirates in black and gold. Pittsburgh even dusted off its famed pillbox caps, although their yellow ones shouldn't have had stars. The Pirates and A's were dominant teams in the 70s, combining for five World Series titles.

Oakland Athletics at Tampa Bay Rays

The Rays finally do a throwback to their own uniforms, the inaugural 1998 season. Or maybe it was the 1999 season - they apparently didn't get the caps right. The A's wore an early-to-mid 1980's dark green throwback.

Seattle Mariners at Oakland Athletics

The Mariners and Athletics wore throwbacks to the 1939 Pacific Coast League Seattle Rainiers and the Oakland Oaks.

Texas Rangers at Oakland Rangers

Celebrating the 40th anniversary of their move to Oakland, the Athletics celebrated with 1986 unis, while the visiting Texas Rangers dressed as their former selves, the 1968 Washington Senators.

Oakland Athletics at Seattle Mariners

Oakland Athletics at Minneosta Twins

The Twins dressed as the 1901 Washington Senators, against the A's, who were dressed as the 1901 Philadelphia A's.

Oakland Athletics at San Francisco Giants

This 1999 interleague game in San Francisco featured the Giants and A's wearing their 1979 uniforms.

Oakland Athletics at Seattle Mariners

Source: http://mariners.freehostia.com/tbtc.htm

From Seattle Times, June 10, 1994:

For tomorrow night's game against Oakland, the Mariners will wear uniforms of the type worn by the Rainiers during their pennant-winning year of 1955 and the Athletics will be attired in uniforms of the Oakland Oaks of the PCL. The first 20,000 fans will receive Rainier caps.

Article available here.

San Francisco Giants at Oakland Athletics