Pre-heat a skillet over medium-high. Spread butter on one side of a slice of bread. Place bread butter side down onto the skillet. Top with 1 slice of cheese, 1 slice of ham, 1 slice of turkey, 2 dill pickle slices, and 1 additional slice of cheese. Butter another slice of bread on one side and on the other side lightly spread a layer of mustard or mayonnaise. Place butter side up on top of the sandwich. Grill until lightly browned and flip over. Continue grilling until the other side has browned and the cheese has melted.