In a bowl, mix crabmeat, cheese, pimentos, mayonnaise, and bell pepper until well blended.
Meanwhile, toast bread.
Spread each slice lightly with butter; then top evenly with crab mixture, spreading it out to edges.
Place sandwiches on a baking sheet and broil 6 inches below heat until bubbly and heated through 3 to 4 minutes.
Eat with knife and fork.