This is "The Armadillo" cuff. (The necklace is no longer available). It was designed circa 1945-50 by Valentin Vidaurreta and made by master silversmith Manuel Altamirano who worked for Valentin and also for Hector Aguilar. It is featured on page 198 of the book SILVER MASTERS OF MEXICO by Penny C. Morrill. The cuff is 5 1/2" around in the inside plus a 1 1/2" opening. It is 1 5/8" wide in the front and in fine all original condition with no damage or repairs. Hallmarked with Manuel Altamirano's hallmark as shown in the photos. A great piece.