Arrange raisin bread slices in a greased 9" x 13" baking dish, overlapping the slices lengthwise. Mix the eggs, Half & Half, vanilla, cinnamon, and nutmeg. Pour over the bread and sprinkle the bread lightly with the cinnamon and sugar. Cover and refrigerate overnight.
Mix butter or margarine, brown sugar and nuts. Sprinkle mixture over bread. Bake at 350 degrees for about 40 minutes.