Best wishes for a speedy recovery, Ford. Don't push it too hard in your recovery. I echo Sal's call for a way to donate to help defray some expenses; I am sure there are many people who are willing to do so.
Like Peter and Jeremiah, I am leaning toward earlier than i originally thought, perhaps late Koto or early Shinto....or, another theory being something even earlier like a katateuchi cut down for wakizashi use, done early enough that the nakago was altered to make it look original?
Thanks Jeremiah; I am using a Nikon auto focus DSLR that has no manual focus ability. I will take some more photos later when it is not bright outside.
More photo experiments; still no luck capturing the masame, which run like bright lines in the ha, ji, and shinogiji. At a certain angle of light, it is very apparent to the eye; also, some nijuba and other hataraki show discreetly.
Apparently my reference to sujikai and kesho yasurime was not an incorrect way to describe the yasurime, as Kokan Nagayama does so as well in "The Connoisseurs Book of Japanese Swords", i.e. p. 280, 283, et al.
I am surprised that there has been no information forthcoming regarding the origin of kesho yasurime from our esteemed members.
http://meiboku.info/guide/form/yasurime/index.htm The first one is sujikai, second is kesho; the file direction is the same after the beginning.I am not fluent in nihongo So, when did kesho start and by who?
All of my sources are saying it began in Shinto times, without further discussion; I have a sword which has the appearance of late Muromachi/early Shinto workmanship of Yamato or Yamashiro tradition, with remnants of kesho yasurime followed by sujikai. Comments please? Edit: it seems that the sujikai I referred to above is superfluous as it is simply part of the kesho pattern according to sources i just looked at.
I did not presume the mechanism of how, just that the damage to the blade exists. Swords were used in WW2, just as you said John, and in other ways such as leading charges, etc. Opinion only, to me, such significant damage to an old sword that had probably survived for hundreds of years, was most likely on a harder target than an unresisting prisoner.