For pie crust, with a pastry blender, blend flour, salt and cold cubed butter. Add vinegar and ice water. Roll out and sprinkle with a little cinnamon and sugar. Roll up like cinnamon rolls. Cut in small slices. Place in deep dish pie plate and press together.
For pie filling, peel and slice apples. Add apples, sugar,1/4 tsp. salt, 5 Tbsp. flour and 1 1/2 tsp. cinnamon. Let stand so apples wilt down and juice up. Fill pie plate and dot with 2 Tbsp. butter.
For crumb topping, combine all topping ingredients with a pastry blender. Sprinkle over apples.
Bake in 375 degree oven for 45 minutes to 1 hour, or until apples are done and pie is bubbly. Serve with vanilla ice cream.