Jaquet Droz Grande Seconde SW Steel Men's Watch J029030440. This watch has a self-winding mechanical movement with a 68 hour power reserve contained within a 45mm case. The dial is black with over-lapping hours and minutes sub-dials in a figure eight covered by a scratch resistant sapphire crystal. The strap is black rubber with a stainless steel folding clasp. Water resistant up to 50 meters.