Interesting. Thanks for keeping an interesting topic alive.
Seems to me that such a policy encourages the removal of stamps, thereby denying future generations ubu-nakato, which is bad form.
I understood shinsa rules to specifically state that an item is to be judged on its own merits, not based on when it was made. Its not the sword's fault as to when it was forged, after all.
I mean, if a sword happens to made for the military, because its war time, and certain conformity must be imposed, to include the need for high-quality/cutting tests, then an inspection mark of acceptance is the way its done.
Seems like extended periods of peace, wherein swords are made as art for wealthy patrons rather than as as killing tools for warriors, is the exception rather than the norm? Was not a sword forged for a samurai in (insert non-showato period here) meant as a weapon first and then, perhaps, as art second?
Seems Japan has a hard time dealing with the ghosts of WW II for sure. Warriors fought with honor in all wars, and to diminish their efforts and tools, just because the exit status was less than desirable, is to commit on ongoing wrong. Somehow I feel if Japan had won the war these "guntos" would have higher esteem, no?
Regards