‘DWTS’ is a sign of amount of Silver (. 999 fineness) used for both sided galvanic processing of 12 items of cutlery. ‘Warranted 12 DWTS’ is 12 x 1.55517384 grams Silver of . 999 fineness. Around 18.66 gram is normally used for both sides of 12 table forks or table 12 spoons (soup spoons).Click to see full answer. Correspondingly, what do the symbols mean on silver?They include: 1) symbol for the town in which the silver content was certified, called an assay or town mark; 2) symbol for the year of manufacture called the date letter; 4) symbol for the standard mark guaranteeing the silver content. The English silver standard is also 925/1000.Furthermore, how can you tell if silverware is real silver? Look for a mark on the silverware of 925, STERLING or 925/1000. The mark is usually found on the underside of the piece of flatware. One of these marks is a surefire way to tell if your flatware is made of sterling silver. Put a magnet on the silverware to see if it is attracted to it. Besides, what does 90 mean on silver? This means that the piece is composed of 80% silver. Compare this with sterling which is, by definition, 92.5% silver. You’ll find many examples here: Silver Marks – Germany. If you see “90”, “100” or “150” on a piece, it’s likely made of silver plate.Is 12 dwt sterling silver?Twelve dwt means that the piece of silver weighs 12 pennyweight. One pennyweight is equal to 1.555 grams; therefore, a 12-pennyweight silver piece weighs 18.66 grams. This is only a measure of weight, however, and does not indicate the purity of silver.