Directly inspired by military-issued designs from decades past, Timex's Field Post 38 Mechanical watch does more than look the part — it features a sturdy crown and screw-down case back giving it 100 meters of water resistance, plus luminous hands and dial markings, a hand-winding mechanical movement and an impressively-tough anti-reflective sapphire crystal. All that functionality comes in a 38mm stainless-steel case — perfectly sized for nearly every wrist and every occasion — fitted with a comfortable brown Ecco™ DriTan™ leather strap that was crafted to last using eco-friendly methods. For the mechanical movement - Wind the crown until you feel a slight resistance. This is best done at the same time each day to keep the watch continually running.