Thank you very much for your reply, Thierry. The working on the iron plate on #1 and #2 are very similar, #3 not so much. I am leaning more toward Nara then on mine.
And its done, hope you are happy with the result, Stephen....as for me I am still reeling from my insurance company expecting a whole years premium to be paid at renewal???!!! Regards my fellow vet.
It is very difficult to say anything with certainty, particularly from photos, but if acid had been used (say to remove rust) then was followed by a stone which had the characteristics that polish the ha and matte the ji, it might look like this. Is the mune of your sword flat? I have a wakizashi that has a similar shape that also shows the ha dark and light depending on the angle, could be the steel and the level of polish. (reminds me when Kawachi sensei was asked about why the steel forms hamon, he said something like "Please ask steel."
I am surprised no one has said "acid" yet.....can't really say so myself, though the very clean condition of the pitting and the bold differentiation of the coloration of the steel is suggestive.
Thanks for the exercise, very interesting. I sometimes wonder if the shinsa experts sometimes pigeonhole smiths into work types that the smiths themselves might have resented.....just my random thought of the morning.
After doing some reading and comparison, I am agreeing with an Aizu Shoami possible attribution, although this seems to also mean that it could be Nara. Thierry Bernard, are you in the house?
I think it is an oxen at rest near some blossoms, with a butterfly hovering above; not sure what is showing on the reverse side. I don't know if there is any deep meaning to this theme, or if it is just a bucolic pastoral scene. The tsuba seems to have some age to it. The sword it came on is alleged to be koto.
Nice blade, poorly cared for, needs a polish. Can't say anything about shoshin mei, but nice package needing TLC. Why do people insist on touching the blade and leaving fingerprints?
page 136, The Art of Japanese Sword Polishing, Setsuo Takaiwa, Yoshindo Yoshihara, leon and Hiroko Kapp.
Also, regarding the appearance of the jigane, it will be affected by the grade of jizuya stone used.