Castle Burg is a landmark of the Bergisches Land, rising above the river Wupper near the Boker Manufactory. Count Adolf II. von Berg had the castle constructed on the foundations of a 10th-century fortress. It was finished in 1133. Today, it is one of the biggest castles in western Germany, inseparably connected to the Duchy of Berg and the Counts von Berg (1068-1225). Even today, Burg Castle still reflects the enormous wealth of the dynasty and their far-reaching influence in Northrhine-Westphalia. Count Engelbert II. von Berg was also the Archbishop of Cologne. Böker keeps in touch with the historians of Burg Castle because the corporate history can be traced back to 1674, when the tree was first entered as the company's trade symbol for tools, and because their history is closely connected to that of the Bergisches Land. Right now, large parts of the castle are being faithfully restored. This includes the replacement of ancient solid oak planks. This inspired Böker to preserve the historic material for future generations, skillfully turning it into handle scales. Apart from the scales of historic oak wood sourced from Burg Castle, the knives also feature brass liners and O1 carbon steel blades. The blades are finished with a special acid wash, which protects them from harmful environmental impact. All styles are handcrafted by Böker Manufactory Solingen as a strictly limited edition of 1133 pieces worldwide and individually numbered. They come with a new version of the historic Böker tree symbol and each box is numbered.