Gil Hodges won a pennant and World Series using four regulars; he platooned eight position players through the rest of the line-up. It was 55 years ago, but Hodges wasn't the first manager in history to platoon.
Three of the everyday guys were his best gloves -- at catcher, shortstop and centerfield; the other was his best hitter...
... that may be the reason they were known as the Miracle Mets. Either that, or the true miracle was having a mound core of Koosman, 26, Seaver, 24, Ryan, 22 and Gentry, 22.