KIH[Purist]
12054
Officially, they do not exist.
But they do. Why and how?
The best guess from the God of Adjustment at SEIKO is that there were bunch of prototype parts made in SS, and someone assembled the movement from the spare parts and put them in the prototype SS cases. His best guess is the SS in the market would be less than 10 or even 5. SEIKO service center will service it, I think. But even if not, my guy at SEIKO will. In fact, I asked him to, when I got one and made it +/- 3 sec per day, and also admitted that all the parts are genuine and this IS GS, although there is no record of it.... And notice that those SS 3180 are all relatively new.
So, rare, but tricky rare. And there is a guy who can service it. They also made Platinum one and it is far rarer....
This is no "Frankenstein", but made with genuine GS parts - thus authentic.
Ken