Bread-and-Butter Pitch (1940)

“From here Vic Klein looks like Hickam’s ace . . . his hooks exploded yesterday and his bread-and-butter pitch hummed like a quail on the way to ‘Spot’ Heard.” Charles Maris, Honolulu Star-Bulletin, September 5, 1940, p20 (Spot Heard was the name of the catcher.)

No earliest use given in 2009 Dickson Baseball Dictionary