The Mark Index https://validator.w3.org/feed/docs/rss2.html What the copyright symbol on costume jewelry tells you How to read British silver hallmarks How to read the marks on a stoneware crock How to research an unmarked piece England and Made in England marks: what they date on ceramics Mexican silver marks: the eagle, registry codes like TS-24 and 925 Nippon, Japan and Occupied Japan marks: what each one dates to Patent numbers and ‘Pat. Pend.’ as dating tools Pottery mark methods: impressed, incised, underglaze and printed Reproductions and fake marks: the known problem areas Silver purity numbers: 925, 900, 835, 800 and where they were used Silverplate marks: EPNS, EP, EPBM, A1 and Quadruple Plate Why 1940s costume jewelry is often marked Sterling Sterling, coin silver or silverplate: how to tell from the marks Where to look for marks on pottery, crocks, jewelry and silver British registration marks: the diamond mark and Rd numbers