I picked up this tsuba for a bargain price, and I have removed some of the active red rust which makes it look a bit better. I am no expert, but I think it looks like a Tembo style tsuba. The measurements are 7.8cm x 7.8cm and it is 5mm thick at the mimi and 3mm thick at the nakago ana. The surface looks much rougher in these scans than it does in the hand, but the colour is quite accurate (on my screen!).
Is my Tembo school thought correct, and what age do you think it is? Also, does anyone have any idea what the stamps are of? I can't find any likely candidates here: http://www.shibuiswords.com/BITsuba2.htm
Thanks,
James