Jacob Hull, now deceased, was a Danish silversmith who designed for Buckmann and Deich, and was associated with the Brutalist school in the 1960s and 1970s. He made all of his own work and signed them all. This bracelet is one of his best, a plain silver cuff, has a focal point of a large amethyst (with inclusions) and two levels, 1 of which is a somewhat smooth square, and another one, of mashed silver plate nuggets, the brutalist part. 1 7/8" wide at the front, 5 3/8" end to end plus a 1" gap for 6 1/4" to 6 1/2". Could be made larger by your jeweler. Marked B+D, J. Hull, Denmark. Excellent vintage condition. If you want to see a more Brutalist bracelet by Hull, see the silver nugget I have listed.