Before 1979: The Eagle System Was Used To Identify The Silversmith,The Location The Item Was Made And The Purity Of The Silver."Eagle Marks" #1= Mexico City, William Spratling, Anita (Hector Gomez), Santos, LosCastillo, AR, CLS, HCV PLATA 925 Heco En Mexico DF, ARI, #2= Bernice Goodspeed,ECP #3= Sigi, JLF, Generic Mark For Guadalajara, SD Or SC, Marciela (Ysidro Garcia), Delfino, Nester, BR, JLF, JN Jacabo, MRV, Ledsema, Piedra Y Plata, Antonia,Hector Aguilar, Generic Mark For Taxco, Orvelo, JS, Abriaca, #5= Chato Castillo #7= Tane? #9= Hector Aguilar #11= Gonzola Morenom, Mexico DF #12= Antonio?, Victoria #13= Conquistador, Spratling #15= Los Castillo #16= Margot #17= Antonio #18= Antonio? #22= Bernice Goodspeed #23= ATE #24= Idetae Mexico D.F. #26= Lopez, Bernice Goodspeed? #30= Spratling #34= Para (Conquistador) #35= Sigi #36= Salvador Teran, Sigi #40=Riveri Castillo #47= Los Ballestero #56= Antonio And Los Castillo On Same Piece #60= Ledesma #63= Spratling #71= Tane? #84= Miguel Garcia #123= Matl #129= Matl Staring In 1979...Until Present Day Mexico Uses A Letter & Number System To Identify The Artisan Who Made The Piece.To Identify Location Piece Was Made In.To Identify The Purity Of The Silver Used In The Construction.What Do The Letters & Numbers Represent?The First Letter Represents Where It Was Made.....T = Taxco....M=Mexico.... City....G=Guadalajara....C=Cuernavaca.... What Does The Second Letter Represent? The Second Letter Is The First Initial Of The Artisans Last Name. What Do The Numbers Represent? How Many Silversmiths Registered The Same Inital Prior To This Silversmith. Example:....TM-26 Means It Was Made In Taxco Mexico By Artisan With Whose Last Name Starts With "M". There Were 25 Other Artisans To Register The Letter "M" With The Mexican Assay Office. Prior To This Silversmith. This Silversmiths # Would Be #26. You Also Know That The Piece Was Made After 1979, Because The Eagle Mark Was Still In Use Until Then. There Are A Few Letters & Numbers Marks That Are Know To Belong To Certain Silversmiths. But Many Marks Remain Unknown, Since The Letter & Number System Began Nobody Seems To Have Made A List Of Them