Early in the career of the Los Castillo taller there were these "artifact" necklaces made. They were all different based on the beads, discs and pre Colombian objects collected. Each piece is truly one of a kind. All that I have found are all hallmarked as shown here. These are not to be confused with similar pieces made after 1980 by Los Castillo and marked with the latter version taxation marks. (Example MS-12) This one has what appears to be a really superb piece of a Mexican jade disk that looks to be imperial. The beads are sterling silver rounds and saucer shapes. The ancient stone beads are off round with differing sized holes made by hand. The large round base that holds the elements together is solid sterling and marked as such. The copper ball in the center of the disk holds the blade with dangles and will spin a full 360 degrees. The sections on the blade are mixed metale of brass, copper and silver with a light brass backing and made by Los Castillo's Taller. Holding in hand you can see the slices of mixed metals on the pendulum's side. The wearable length is a good 16in.long. This is a statement maker as the drop is 3.5in. tall with dangles. The ancient jade disk has a 1 5/8 in. diameter. The weight is 104 grams heavy. There are no chips or damage. To own one of these is truly a treasure, just LOOK AT THAT NECKLACE!