Hamilton Jazzmaster Open Heart Gentleman's watch model H32705731. Features a stainless steel case, black alligator leather strap. The dial is black with silver Arabic numerals and stick hour markers on the open heart exhibition movement visible through an exhibition sapphire crystal at 6 o'clock. Automatic self-winding mechanical movement powered by the wearer's motion. Scratch resistant sapphire crystal for both the main display and the exhibition case back. Case size 42mm, suitable for most wrist sizes. Includes WatchMaxx warranty of two years.