Casio ARW-320. Japan movement. I am the original owner. Works perfectly. If I recall correctly, in 1994 my wife purchased this Casio altimeter watch for me as a birthday gift. At the time we were doing weekend hiking in the Washington Cascades. For over 30 years I’ve kept this beautiful watch in its original working order including periodically replacing the batteries while refreshing the o-rings. I’m not a watch reseller so I don’t have sophisticated display tools. However, in my opinion, the photographs indicate an example of superior vintage ARW-320 in demonstrated working condition. As I’m old I can’t imagine this watch being inherited by my grandchildren as recalibrating the pressure altitude would be beyond their comprehension! If my pricing is off, let me know. Otherwise, good luck.