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Need help identifying Tiffany maker's marks

[size=150]I have an old (I’m guessing >100 years old) piece marked Tiffany & Co. Sterling. It also has 2 additional marks, 1) an S inside a circle with wings on each side, and 2) the letters PP. Can you tell me what these marks mean and year of manufacture?[/size]
Tiffany mark PP.JPG
Tiffany mark S in wings.JPG