The Argyll Container (Teapot / Coffee Pot / Gravy Boat) was named after the Duke Of Argyll in the 18th Century. The Argyll Teapot kept its contents warm by surrounding the inner container with a metal jacket containing hot water.
Annotated Description Of An Argyll Teapot
1 - Primary spout for contents to be poured out of Argyll.
2 - Ivory inserts to prevent transmission of heat through the handle.
3 - Secondary spout for hot water to be poured into outer jacket of the vessel.
4 - The copper undercoat onto which the silver is fused during manufacture is showing through, thus quite clearly confirming the item is not sterling silver. This is known as ‘bleeding’.
A - Crown depicting Sheffield.
B - The letters ‘PP&S’ represent the manufacturer’s initials and are for the company of Padley, Parkin & Staniforth of Sheffield. These marks were used during period c. 1855 - 1880
C - Hand emblem which is the registered trade mark of the manufacturer and was registered around the same time as the initials of the manufacturer.
For further information on how to Identify Maker's Marks and Silver Hallmarks see this feature