Preheat oven to 350 degrees F (175 degrees C).
Sift the flour, baking soda, salt, cinnamon and nutmeg into a large bowl. Mix in the pumpkin, brown sugar, buttermilk, egg and butter until well blended. Pour into a 9×5 inch loaf pan and smooth the top.
Bake for 1 hour in the preheated oven, or until a toothpick inserted into the center comes out clean.
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