Thanks for comments and observations. What do I think? I still have more questions than answers. Studying the piece makes me think it's creator would have had the skill to execute a finer, more geometric design if that had been his intention. A red hue is evident in the picture, which would normally indicate fire damage but in natural light this is not seen and is due to the lighting conditions when I took that picture. Re-patination?. That is a possibility. Do I think it has been? No.
The sword is 45cm long and of wide proportions. O-kissaki, mumei, ubu. F/K- Soten copy -Uji River. Menuki of foilage/fowl - very average. The entire sword had been subject to years of neglect and abuse, covered in some unknown substance, solified glue/shellac? With regard to the tsuba, several hours of removing the grime with a soft dry cloth revealed it as it is shown now. Beauty or is it in the eye of the beholder? Re-patination? Yes, a possibility but done decades ago. Do I think so? No. I think the poor storage has lead to the permeation of moisture lifting the original patination. In effect spalling. Spalling can also be evidenced in fire damaged buildings!!
Getting back to the blade, Shinshinto? Yes. Sobre, strong functional - I should imagine very. Menuki/FK everyday average. So what quality of tsuba would be expected to bo found with such a sword?? For me the word enigma comes to mind. I will try to send another picture soon - I tried yesterday but they were to large became invalid and disapeared into the ether along with what I had written.
Mick