ONE-PIECE shakers are unique because both salt and pepper are dispensed from one shaker piece. The shaker may be one figural form with a division inside to separate the spices or consist of two separate figural forms pressed together while the porcelain or ceramic is still wet to form a union. Either way, the finished piece is one shaker with separate fill and shaker holes for both salt and pepper.
Classic styles are the bellboys with their suitcases and the longboy animals with salt in one end and pepper in the other.
ONE-PIECE Examples: