Sinn Watch T50 GBDR White Silicone 1052.020 White Silicone. The T50 GBDR is a completely separate and masculine counterpart to the T50 GOLDBRONZE, even though this timepiece has a number of technical features in common with the T50 GOLDBRONZE. The key design element of the T50 GBDR model is the captive safety diver’s bezel made of Goldbronze 125. It harmonises perfectly with the matte black dial – an interplay that skilfully contrasts with the more objectivetechnical appearance of the bead-blasted and anti-allergenic high-strength titanium case. Both watches have a diameter of 41 mm and are suitable for wear in any situation, including on narrow wrists.