On October 16, 1969, the Mets won the World Series...
* They won, despite being at a nine-win disadvantage to the Orioles in regular season play (100 to 109). After the 1969 Mets, no NL team won a World Series at that big a disadvantage until 1988, when the 94-win Dodgers beat the 104-win Athletics.
* They beat a team with 109 wins. Only two teams have won the World Series by beating a team with more wins: The 1954 Giants (54 Indians won 111) and the 1906 White Sox (06 Cubs won 116)
* They held the Orioles to a .146 batting average. That's the second-lowest batting average a team has ever had in the World Series. Only the 1966 Dodgers (.142) hit worse.
* They won despite hitting .242 in the regular season- Only 4 Mets teams have had a worse batting average since (1972, 1974, 1983, 1992)
* Jerry Koosman allowed 11 baserunners in 17 2/3 innings, for a WHIP of 5.6. Only one pitcher, who pitched at least 15 innings in a World Series, has had a better WHIP since- Steve Blass (1971 Pirates, 5.5).
* Koosman pitched a complete game to clinch the World Series, something only three NL pitchers have done since (Steve Blass, Orel Hershiser, and Josh Beckett). Koosman is the last NL pitcher to throw a complete game AT HOME to clinch the World Series.
*Al Weis hit .455 in the World Series, which stands as a Mets record to this date. Next-best was Rusty Staub, who hit .423 in 1973.
* In the clinching game, the Orioles did not have an at-bat with a runner in scoring position. I intend to check, but I don't believe this has happened in a World Series game since then.
* The Mets clinched by rallying from 3 runs down to win. Only three teams since then have clinched the World Series by rallying from 3 runs down to win the clincher- the 1970 Orioles, the 1975 Reds, and the 1986 Mets.
* The 1969 Mets won 4 straight games to close out the postseason. The longest Mets postseason win streak is 5 games, spanning the end of the 2000 NLDS and the start of the 2000 NLCS.