Marvel at the inner workings of this dual aperture dial self winding mechanical from the BVA Series, featuring clear exhibition caseback. The 21 jewel self winding movement means battery-free operation and provides for years of reliable service. The crisp black dial includes a wealth of details including roman numerals, minute track and 2 sub dials. All stainless steel construction provides hypo-allergenic and durable build quality from Bulova.