Rare antique American (.900) coin silver 5-piece tea and coffee service hallmarked "Whartenby & Bumm" of Philadelphia, Pennsylvania, Circa 1816-1818.Thomas Whartenby and Peter Bumm were independently successful silversmiths in Philadelphia who worked together to create certain pieces from 1816-1818.1 Tea & 1 Coffee Pot: 9-1/2" High x 11" Wide x 6" Deep2 Sugar Bowls with Lids: 8" High x 7" Wide x 6" Deep1 Cream Jug: 7" High x 6" Wide x 4" Deep.