This is the Citizen Promaster Professional 800M Diver from October of 1991'. The watch is fully operational and has only one non original part which is the bezel insert. Strap is the original style that was supplied with this model. These are hard to find collectable models and this example other than having a slight bit of wear to various parts of the Titanium case and bezel the dial lume is fantastic and shows no signs of lume rot or water intrusion. Just let me know if you'd like more than the 10 pictures they allow on a post.