This item comes from Yemen, but it was not made there. The center for fabricating this kind of prayer rope was Istanbul, Turkey, capital of the Ottoman Empire, during the 1800s. The silver used in such work had to be up to the Empire's standards. By the early 1900s, the Empire was gone but these antique prayer ropes have lasted.
Bead measurements 9mm (0.34in) long; 8mm (0.32in) diameter; total weight a bit over 75 grams.