2010 and 2012 World Series Champion San Francisco Giants

There have been 18 different occasions throughout the history of the World Series where a team has won the World Series at least 2 out of 3 seasons.  2 World Series Championships in 3 years may not exactly qualify a team as a dynasty, but it is interesting to look at the rosters of these teams, particularly paying attention to the Hall of Famers that each team had.  When doing this evaluation, the San Francisco Giants stand out as the most unique team in terms of the players they won their 2 out of 3 World Series with.  Here's a detailed list of teams that won at least 2 World Series in 3 years, and the Hall of Famers they had on their team:

1907 and 1908 Chicago Cubs: Mordecai Brown (SP), Frank Chance (1B), Johnny Evers (2B), Joe Tinker (SS)

1910, 1911, and 1912 Philadelphia Athletics: Eddie Plank (SP), Chief Bender (SP), Eddie Collins (2B), Home Run Baker (3B), and Herb Pennock (RP, 1913)

1915, 1916, and 1918 Boston Red Sox: Babe Ruth (SP), Tris Speaker (OF, 1915), Harry Hooper (OF), Herb Pennock (RP, 1915-16)

1921 and 1922 New York Giants: High Pockets Kelly (1B), Frankie Frisch (2B/3B), Dave Bancroft (SS), Travis Jackson (SS, 1922), Ross Youngs (OF)

1927 and 1928 New York Yankees: Waite Hoyt (SP), Herb Pennock (SP), Stan Coveleski (SP, 1928), Bill Dickey (C, 1928), Lou Gehrig (1B), Tony Lazzeri (2B), Babe Ruth (OF), Earle Combs (OF)

1929 and 1930 Philadelphia Athletics: Lefty Grove (SP), Mickey Cochrane (C), Jimmie Foxx (1B), Al Simmons (OF), Note: Eddie Collins was on the roster, but only appeared in 9 Games in 1929 and 3 games in 1930.

1936-39, 1941 and 1943 New York Yankees: Red Ruffing (SP, 1936-39, 1941), Lefty Gomez (SP, 1936-39, 1941), Bill Dickey (C), Lou Gehrig (1B, 1936-39), Tony Lazzeri (2B, 1936-37), Joe Gordon (2B, 1938-39, 1941, 1943), Phil Rizzuto (SS, 1941), Joe DiMaggio (CF, 1936-39, 1941)

1942, 1944, and 1946 St. Louis Cardinals: Stan Musial (1B/OF), Red Schoendienst (2B, 1946), Enos Slaughter (OF, 1942 and 1946)

1947, 1949-53 New York Yankees: Whitey Ford (SP, 1950 and 1953), Yogi Berra (C), Johnny Mize (1B, 1949-53), Phil Rizzuto (SS), Joe DiMaggio (CF, 1947, 1949-51), Mickey Mantle (RF/CF, 1951-53)

1956 and 1958 New York Yankees: Whitey Ford (SP), Yogi Berra (C), Phil Rizzuto (SS, 1956), Mickey Mantle (CF), Enos Slaughter (OF)

1961-62 New York Yankees: Whitey Ford (SP), Yogi Berra (C, LF), Mickey Mantle (CF)

1963 and 1965 Los Angeles Dodgers: Sandy Koufax (SP), Don Drysdale (SP)

1972-74 Oakland Athletics: Catfish Hunter (SP), Rollie Fingers (RP), Reggie Jackson (OF)

1975-76 Cincinnati Reds: Johnny Bench (C), Tony Perez (1B), Joe Morgan (2B)

1977-78 New York Yankees: Catfish Hunter (SP), Reggie Jackson (RF), Rich Gossage (RP, 1978)

1992-93 Toronto Blue Jays: Roberto Alomar (2B), Dave Winfield (DH, 1992), Rickey Henderson (LF, 1993), Paul Molitor (DH, 1993)

1996, 1998-2000 New York Yankees: Wade Boggs (3B, 1996), Note: Derek Jeter (SS) and Mariano Rivera (SP) are still currently active, but future HOFers.

As seen up to this point, the first 17 teams to accomplish winning at least 2 World Series in a 3 year span have all been had multiple Hall of Famers.  This leaves us with:

2010 and 2012 San Francisco Giants: Obviously too early to tell, but the only player on pace so far towards Cooperstown would be Buster Posey.  As it always does, time will tell.