I may have something of interest. I came into a decent size collection all at once and have a katana with Satsuma mon on the kashira and also on the koiguchi of the saya, both seem to be sterling silver. Fuchi however is old iron with no mon. Saya appears to be old, it has a large iron kojiri with great patina on it. The tsuka was rewrapped in the 1980's according to my notes, and the koshaire is sort of tachi style, but not an elaborate one. The blade may be koto, but I have not done much research at all on this piece. Blade is good condition and in decent polish. If it did not have a few kitae-ware on one side, it would be an excellent blade. I am not sure the blade is from the Satsuma area. If this interests you at all, let me know, I will take some pics but it may take a week or two.
Jason