GREAT GRANDMA KELLER'S PUMPKIN CUSTARD PIE

1 1/2 Cups Pumpkin
3 Eggs
1 1/2 Cups Milk
3/4 Cups Sugar
1/2 tsp. Cinnamon
1/4 tsp. Nutmeg
1/2 tsp. Pumpkin Pie Spice
1 Tbsp. Butter melted
1 tsp. flour mixed in a little milk

Mix all ingredients well. 
Bake in hot oven (450 degrees) for 10 minutes and then moderate oven (325 degrees) for about 30 minutes.