Preheat oven to 350°. In a large bowl, mix flour, 1/2 cup sugar, 3/4 teaspoon cinnamon, ginger, salt and allspice; cut in butter until crumbly. Reserve 1/3 cup for topping., Stir baking powder and baking soda into remaining flour mixture. In a small bowl, whisk egg, buttermilk and molasses. Add to flour mixture; stir just until moistened. Transfer batter to a greased 8-in. round baking pan., Add remaining sugar and cinnamon to reserved topping; sprinkle over batter. Bake 20-25 minutes or until a toothpick inserted in center comes out clean. Cool completely in pan on a wire rack.