About This Watch: This Mont Blanc Star 4810 Collection 102377 has an automatic chronograph movement. It features a black guilloche dial, rhodium-plated regate and baton hands, luminescent hour and minute hands, and a scratch resistant sapphire crystal. Its finely crafted 44mm case is made out of stainless steel. This watch is water resistant up to 30 meters; 100 feet; 3 atm.