This is Los Castillo #508 and is definitely a Margot design. Beautiful perfect condition with no dents or dings weighing 73 grams and having a 3in. face length that tapers to 1in. in the back. The inside dimension is 2.5in. across and has a strong spring. The size of this bracelet makes it extremely comfortable to wear with no overhang way onto the hand restricting movement. Museum and collector quality!