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https://www.smpub.com/ubb/Forum10/HTML/000176.html
It has two marks on it: "GM","925" stamp in very small square boxes on the back. About the "GM", all I can find out is it may be the makers mark of Gideon Myrick, who was born in 1736,and was a Goldsmith.
https://www.globalgemology.com/g.html
GORHAM Hallmark(s): "Gorham", "G" Information: Gorham Silver was founded in 1831 by Jabez Gorham and Henry L. Webster, in Providence, Rhode Island. Gorham has produced silver for the White House, as well as prestigious trophies including the Borg-Warner Trophy for the Indianapolis 500, the Davis Cup for tennis, and the America's Cup for yachting.
http://www.amaterracrianza.com/jewelry-makers-marks-in-alphabetical-order/
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https://www.invaluable.com/blog/guide-to-jewelry-marks/
Apr 06, 2020 · Jewelry Maker’s Marks: A Brief History To be considered an antique, a piece of jewelry must be 100 years or older, while vintage jewelry must be more than 20 years old to be classified as such. “Retro” jewelry refers to pieces made during the 1940s and ‘50s and are characterized by the use of large and colorful gemstones.
https://jewelry.lovetoknow.com/about-jewelry/understanding-markings-jewelry
You may notice the following metal stamps or markings on your jewelry: Marking. What It Means. A number, followed by "k" or "karat". The item is gold. The purity of the gold varies by the karat number, with "24k" being nearly solid gold and "10k" being 10/24 gold. "Gold-filled" or "GF". The piece is mostly made of base metal, but it has a sheet ...Author: Kate Miller-Wilson
https://www.leaf.tv/articles/how-to-identify-jewelry-markings/
Remember that an “18K” mark means jewelry is 75 percent pure gold, or 18 parts pure gold out of 24. Note that “750” or “18KP” marks also indicate 18-karat gold jewelry. Know that jewelry marked “14K” is 53.8 percent pure gold, or 14 parts pure gold out of 24.
https://www.globalgemology.com/a.html
Information: A.J. Goldfarb, Inc. is a manufacturer of jewelry findings that was founded in 1949, in New York City. Works in gold, silver, and base metals. Information: A. Jaffe, Inc. was founded in 1892 by Albert Jaffe, in New York City. Works primarily in gold and platinum.
https://worldeccentricitycharm.com/blogs/news/costume-jewelry-hallmarks-a-to-z
Costume Jewelry Hallmarks: A to Z Posted by Laurie Zeiden on Sep 06, 2018 My blog series, Costume Jewelry Hallmarks , is an ongoing project to catalog costume jewelry hallmarks.
https://abbreviations.yourdictionary.com/articles/list-of-standard-jewelry-abbreviations-with-meanings.html
Jewelry can be made from a variety of metals, including gold, silver, and platinum. Each piece is stamped to mark its metal content, and you can also use the abbreviation to tell if the piece is plated or solid. These are a few of the most common abbreviations you’ll see: 10K - 10 karat gold
http://junkboxtreasures.com/research/jewelry/graphic_marks/graphic_marks.html
Aarre & Krogh Mark. Aarre & Krogh Mark. Allsopp Brothers. American Jewelry Chain. Marshal Metal Manufactory Ltd. Alwand Vahan. Andreas Daub (Germany) Attwood & Sawyer. Unknown.
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