Vintage Taxco Mexican Sterling Silver Round Brooch Pendant Abalone Inlay

This is a wonderful sterling silver brooch made in the form of a large round “disc”.  The piece is inlaid with abalone mother of pearl.  The piece has both a pin and a hook at the back so the that it can be worn either on a chain as a pendant or as a brooch.  The back is stamped “925 Sterling Taxco” along with the number 3 within the Eagle assay mark - there is some other text that I can’t make out and a G type mark.  I have not been able to identify the maker, but the number 3 Eagle mark was shared by some excellent Taxco silversmiths, including Bernice Goodspeed, Sigi, Hector Aguilar, Marciela and Ledesma, but was also used simply as a generic mark denoting Taxco.  It measures 2 1/4” in diameter and weighs 22 grams.  It is in very good condition with no wear - I have not polished the brooch.

This is a rather interesting design that pre-dates 1979 (when the Eagle system was dropped for a letter and number system).  Vintage piece of Mexican silver