How about a 1200T with just a gold face on it? A smallish dial of real gold couldn't be that much more and it would be a lot easier to engineer than the case, bezel and bracelet. It could say Doxa in the upper left like usual and let's call this one the Sub 1200T "Treasure Seeker" in the lower right. On the back it could say Doxa Sub 50 years 1967-2017 and be number 1/50, a 50 piece edition.
How do you guys like that idea compared to the solid gold? I think the Treasure Seeker name sounds pretty cool!