Based on the marks on the inside of the cuff (shown in the second photo,) it was made by Chato Castillo, which explains the quality of the work. The thing is, there are also a couple of marks on the outside of the cuff, shown in the third photo. The '900' is easy enough, but what is the large "M" with the small "c" above it? I haven't run into this mark before, and my copy of the little book of marks has grown legs. Could this be the person who designed the bracelet, perhaps?
By the way, while the marks show up well in the photographs, that's because I cropped and shaded the photos to show them -- just looking at the cuff, the marks are hidden well enough in the design that it took me a while to find any of them at all. This is one of the most gorgeous pieces of silver I've found yet... :-)
tmc