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https://www.925-1000.com/mexican_marks.html
The intaglio "900" mark is found on work dating from the turn of the century until the 1920's. The intaglio marks "980, 960, 940 & 925" are usually from the mid 1930's to the mid 1940's. The incuse mark "970" was the favorite standard of Antonio Pineda. Most work from ca.1950 onwards is stamped "Sterling" or with an incuse "925" stamp.
http://www.silvercollection.it/mexicosilvermarks.html
In the first half of the 20th century silver items manufactured in Mexico were marked simply "silver" or "sterling". Usually a location (Mexico or a town name) and silver fineness (925, 925/1000, 950, 980) was included. In 1948 the Government of Mexico promoted the reintroduction of the "eagle mark" to identify the manufacturers of silver items.
http://nobelantik.dk/www/mexican_marks.html
Above is a sampling of Mexican silver purity marks ranging from ca.1900 to the 1970's. The "Mexico Silver" or "Silver Made in Mexico" marks are seen on pieces from the 1920's through mid 1940's, their silver standard varies, but is commonly above.925 purity. The following number marks indicate silver purity in a percentage of 1000ths.
https://www.globalgemology.com/mexican-silver-marks.html
Mexican Silver Marks. Photo courtesy of Scott Papper, GIA GG, AJP, CM (NAJA), Global Gemology & Appraisals. Mexico's jewelry hallmarking system has undergone several changes over the course of history. In 1946, an Eagle Hallmarking System was implemented. It was used through 1979, when it was ultimately abandoned due to its inefficiency.
https://oureverydaylife.com/how-to-read-fine-silver-jewelry-marks-on-mexican-jewelry-12228377.html
Sep 28, 2017 · Mexican silver jewelry may be marked.925, which means it is 92.5 percent pure silver; this is the minimum standard for sterling silver in the United States. It's not uncommon to encounter Mexican silver with marks of.950,.970 and even.980. Look for marks indicating area of origin.
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