The originals were made from 1982-1990, 8 years. I have no idea how long they'll make these. Probably various considerations, sales, inventory of parts pre- purchased and contracted for, planned obsoleting and shift in another direction, etc. I guess you could contact them and ask. I don't know if they even know, or if they would give you a answer (corporate secret stuff perhaps), but you could give it a try. Perhaps tell them you are thinking about purchasing all 5 versions in the future at affordable intervals and you'd like a idea of the availability window.Absolutely love this thread. Since history tells us Arnie runs aren't infinite, does anyone have any insight about how long Seiko typically offers these? It'd be nice to at least have some kind of heads up before they fade away again.