Experts can spot Alt-Faden by Robbe & Berking in an instant. The thread pattern of this design produced by Robbe & Berking originated around 1760, and Augsburg silversmithing with a single or double silver thread as a border dates back to a very early period. Experts recognise the thread repeated on the back and ending in a scallop shape as the distinctive signature of Robbe & Berking.