Pottery & Porcelain Marks – Crown: Marks showing crowns have been used since the early 18th century and are still in use today. While some marks are the basic design of a curved line on the bottom with lines jutting out toward the top, most marks are crowns with elaborate details. Capo-di-Monte factory in Naples, Italy, used a mark of a crown over the letter "N." After the Capo-di-Monte factory closed, the Ginori factory in Doccia, Italy, purchased the mark. The mark was used from 1771 to 1821 and was originally hand-painted over or under the glaze. Companies both in and outside Italy have used the mark ever since. The country name appears under the mark after 1891, if the pottery or porcelain is sold in the United States. The Crown and N is one of the most faked marks found today.