Cream butter and 2 cups sugar. Add eggs, one at a time, beating well after each addition. Add vanilla; mix well. Combine flour, baking powder, baking soda, and salt; add to cream mixture alternately with sour cream. Spoon 1/3 of the batter into a greased and floured 10 inch tube pan. Combine cinnamon and remaining 3/4 cup of sugar; sprinkle 1/3 over batter. Repeat layers twice. Bake at 350 degrees for 60 minutes. Cool for 10 minutes before removing from pan.
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