I have a Japanese-language knife magazine that I bought locally at a Japanese chain store, and it has an article about G. Sakai, and it has photos of their workers making the Spyderco Clipits (Salts, Delicas/Enduras, etc., etc.) in their factory. I think the Seki clipits are probably all made by G. Sakai; maybe in the past there were also some made by Moki, though.
I'd actually prefer the FRN models had a hollow-grind as well, as the blade spine thickness would still be the same, but the slicing ability would be better. Though I still find great use for the flat saber-grind of the D4/E4 FRN's.
Jim