February 2011. BURG-WÄCHTER presents new letter-boxes. The models Opera and Quadus are made of rust-proof and uncoated stainless steel and attract customers due to their hand-polished surfaces. Opera fits into every modern ambience due to its fine elegance: Stylish & Noble. In contrast, Quadus is based on an absolute straightness and minimalistical design. It affects through its material and shape: Pure. Simple. Characteristical.