So, should you ever want to sell or trade it...
Unfortunately I cannot confirm anything about the originality of the caseback. If it is original, I would say the watch is from 1995. Could you please post a picture of the caseback?
It looks like a 1990s model. I believe that Citizen only used automatic and Eco-Drive movements for its top-of-the-range divers since then.
The quartz movement may well be of the same quality as the movements used in the 1980s/1990s professional series.
One more thing, I think the non-plated version came with white-on-black day and date wheels. Anyway, your plated version looks superb!