I think the Citoris are
made by Miroku in Japan, or at least were for a time.
Fine quality, as was everything made in Japan in the 70s and 80s. Better optics than the Germans, better cars than the US, and all for less money. Revaluation of the Yen, and Japanese workers' (justified) demands for better wages closed the price gap,but for a while there, Japanese goods were as cheap as Chinese stuf is now, and far, far better in quality.
The 24 has always interested me.
Safety note: If you have both a 16 and a 24, be aware that the old 12/20 problem can bite you as well. Granted, the number of people who need to worry about this can probably be counted without resorting to your toes, but still...
--Shannon