Marks
Marked sterling silverware has imprinted hallmarks that identify the silver's purity. Hallmarks may have a maker's mark with it and give clues to country of origin, the metal content and date of manufacture.
Pattern Details
Marked silverware will belong to a specific, identifiable manufacturer's pattern. Some patterns are more common--and less valuable--than others. Certain serving pieces within a pattern may be more valuable than a regular place setting.
Monograms
Monograms are engraved initials on the silverware handle. Monograms do not detract from the value on rarer silverware, as some collectors consider monograms to be a lost art form.
Damage and Repairs
According to British silver expert and ASCAS member, Giovanni Ciceri, "The appeal and the value of an antique silver is strictly related to its overall condition." A silversmith can repair damaged silver, although it may be cost-effective only for rare pieces.
Fun Fact
Because antique silver is valuable, silver with forged hallmarks or modified to look like a rarer piece of flatware is common on the antique silver market.