I purchased this watch some years ago, took the tags off and never wore it. eco Drive, brand new condition. Great piece. Please see below for manufacturer description of watch - still for sale @ $275 Product Description: Product Description For a rugged look with a comfortable fit, this military-inspired timepiece fits the bill. with a day-date indicator, luminous hands, 37mm screw-back case, and 100M WR. The black dial provides a backdrop for simple Arabic numerals, housed in a stainless steel case along with a woven green strap with patterned stitching and a buckle clasp. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number E100.