From the Expedition North Collection. Directly inspired by military-issued designs from decades past, the 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 a scratch-resistant, anti-reflective sapphire crystal. All that functionality comes in a 38mm stainless steel case and bracelet. 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. Mechanical hand-wind movement Stationary bezel Sapphire crystal Black dial Arabic full-hour markers Triangle at 12 hour marking Second hand Black stainless steel case and bracelet Deployant clasp/. Timex Boutique. Color: Black. Size: 38 mm.