The stunning top-of-the-line Citizen Promaster Altichron BN4045-12X from the world-renowned Promaster series, featuring a variety of distinctive watches with excellent features. The superb Citizen BN4045-12X is a combination of a stainless steel case with a PVD finish, designed for mountain conditions. This model has a screw down crown. The watch has features for mountaineers including: easy readability, altimeter compass indicator function and altitude calibration maximum height indication decompression scale. This model meets ISO 6425 and includes high luminescent hands and  battery discharge indicator. 20 ATMs.