ONLYATNM Only Here. Only Ours. Exclusively for You. Luminox Special Ops Challenge Watch from the 4220 series. Official watch of the Navy SEALs. 45mm black stainless steel case. Sapphire crystal antireflective coating. Black polyurethane strap with security buckle. Quartz movement. Illuminated hands and hour markers. Date window. Water resistant up to 20atm. Includes carrying case, instruction manual, additional webbing buckle strap, and springbar tool. Made in Switzerland.