Cut bread into 6 x 3-inch pieces with a serrated knife. Slice bread horizontally to open. Spread a thin layer of mayonnaise on the 4 top halves and a thin layer of mustard on the 4 bottom halves. Arrange one-fourth of the ham evenly on each of the bottom halves, then stack a fourth of the pork, 2 pickle slices and a fourth of the cheese on each. Cover sandwiches with the top halves of the bread.
Grill sandwiches in a buttered sandwich press until they are flat, the bread is browned, and the cheese has melted. If you do not have a sandwich press, substitute a waffle iron. Cut each sandwich in half and serve at once.
