Grease a 13x9x2 inch baking dish. In a large mixing bowl, beat eggs, milk, brown sugar, raisins, vanilla, 2 teaspoon cinnamon and salt. Mix in bread until all bread is wet. Put bread mixture into prepared baking dish. Cover and refrigerate for 8 hours or overnight. Remove from the refrigerator 30 min. before baking. Dot with butter. Combine sugar and remaining cinnamon and sprinkle over the top. Bake at 350 for 45-50min., or until a knife inserted near the middle comes out clean. Serve with your favorite syrup.