1) Edo and earlier blades with correct mei, or mumei blades on which the time period, kuni and group can be identified, may receive Hozon paper.
2) Blades that meet the criteria given above can receive Hozon paper even if they are slightly tired or have kizu, as long as those may be permissible in their appreciation.
3) Repair on jiba is permissible, unless it significantly impairs the beauty of the blade.
4) Blades made in the Meiji period and later can receive Hozon paper only when the blade is well made and zaimei.
5) For Nambokucho and earlier zaimei blades by famous smiths, re-temper can be permissible if the blade is valuable as a reference, and if the jiba and nakago are sufficiently well preserved. However, this will be documented as "yaki-naoshi" in the paper.
6) Blades are put to "reservation" (horyu) if a decision could not easily be made on the authenticity of the mei. This also applies to mumei blades in which an attribution is difficult to make.
Tokubetsu Hozon Token
1) Blades with Hozon papers, good workmanship and state of preservation can receive Tokubetsu Hozon paper.
2) Blades with the following conditions are excluded from point 1.
a. Re-tempered blades may not receive a Tokubetsu Hozon paper, as a rule, unless they date not later than Nanbokucho, are zaimei, by famous smiths, if the blade is valuable as a reference, and if the jiba and nakago are sufficiently well preserved.
However, this will be documented as "yaki-naoshi" in the paper.
b. Muromachi and Edo period mumei blades may not receive a Tokubetsu Hozon paper, as a rule. However, if a blade is attributable to a famous smith and in excellent condition it may receive Tokubetsu Hozon paper.
Blades with Tokubetsu Hozon paper can receive Juyo if one of the following points is true:
1) Blades of extremely high quality workmanship and state of preservation, and judged as close to Juyo Bijutsuhin, may receive Juyo Token paper.
2) Blades that meet the criteria given above and made in or before Nambokucho may receive Juyo Token paper even if they are mumei. Blades made in the Muromachi period have to be zaimei and blades from the Edo period and later, as a rule, have to be ubu and zaimei to receive Juyo Token paper.
Tokubetsu Juyo Token
Among Juyo Token, the ones of excellent quality and superior condition, judged as the same as the top level Juyo Bijutsuhin, or conceivable as equivalent value as Juyo Bunkazai, may receive Tokubetsu Juyo Token paper.