Sterling Silver

Most American sterling is marked Sterling, 925, or 925/1000.  Sterling silver is a minimum of 925 parts pure
silver to every 1000 parts.  

Prior to the enactment of the Stamping Act of 1906, there were no national laws requiring silver objects to be
marked in any manner, although quite a few states had already adopted their own laws.  The Stamping Act of
1906
required all items being sold as sterling silver to be marked as sterling.

Prior to 1906, marking a piece Sterling or 925 was at the discretion of the maker.  Most makers, however,
were proud of the fact their objects were made of sterling, and boastfully marked their items as such.

A piece may be marked 935, 950, or with another higher grade.  This is still considered sterling silver, but has
a higher silver content than that required by the sterling standard of 925.

The term English Sterling was occasionally used on sterling objects during the coin silver era prior to 1868.  

Also during the time when coin silver was the predominant silver grade in the U.S., the Maryland Legislature
passed the Assay Act, requiring all silver in Baltimore to be assayed.  In 1830 the law was changed to no
longer require the assaying of silver, but then required makers to mark their silver with quality designations.  
Silversmiths outside of Baltimore also started adopting this practice.  Sterling silver is 11 ounces 2 pennyweight
silver per 12 ounces Troy, so sterling silver from this place and time is marked 11.2 or 11-2.
Coin Silver

Coin silver may have a variety of marks or may not be marked at all.

Coin silver originally was made from melting coins from various countries.  These coins were minted using
varying grades of silver.  The U.S. adopted a 900/1000 standard for American silver coinage in 1837, but as
silversmiths continued to use predominantly foreign coins to make their silver goods, the actual silver content
of coin silver objects can vary.

The word Dollars on silver indicates an object was made from melted silver dollars, so is coin silver.

The word Standard used on silver indicates it was made to the U.S. silver standard after 1837, so 90% pure.  
Please note, however, that the word Standard can also be used on silverplate to indicate something altogether
different.

Due to the Assay Act of 1814 passed in the State of Maryland, a mark of the Baltimore Coat-of-Arms or
the numbers 10-15, 10 oz 15, 1015, 11, 11 oz, or 11-12 also are an indication of coin silver.  Please see the
Baltimore Assay Marks section for more information.
Silverplate

Silverplated objects may have a wide variety of marks, or may have no marks at all.

The following terms all indicate an item is silverplated:
A1
AA
Coin Plate
Deepsilver or Deep Silver
Double or Double Plate
Electroplate
EP
EPC
EPBM
EPNS
EPWM
Extra Coin Plate
Extra Plate
Plate or Plated
Quadruple or Quadruple Plate
Reinforced Plate
Silver Plate or Silverplate
Silver Soldered
Sterling Inlaid
Sterling Plate
Triple or Triple Plate
XII
XIV
XS
White Metal

A white metal is an alloy of tin and other metals.  White metals contain no silver.

The terms below are for different types of white metal.  Some are trade names, others are generic terms.
Alpaca or Alpacca Silver
Aluminum Silver
Austrian Silver
Brazil or Brazilian Silver
Bristol Silver
Burmaroid Silver
England Silver
German Silver
Indian Silver
Japanese Silver
Laxey Silver
Mexican Silver
Nevada Silver
Nickel Silver
Paktong
Pearl Silver
Potosi Silver
Solid G Silver (aka German Silver)
Sonora Silver
Tyrol Silver
Venetian Silver
Yukon Silver