The following items are to be written on the certificate.
Shubetu (種別): classification such as Katana, wakizashi, tanto, and so on
Nagasa (長さ): blade length in centimeter
Sori (反り): curve in centimeter
Mekugi-ana (目くぎ穴): number of mekugi-ana
Meibun (銘文): mei, date, etc.
Biko (備考): notes
FYI: APPLICATION OF THE SWORD LAW AND RELATED TOPICS
http://www.nihontokanjipages.com/japane ... _laws.html