certificate of authenticity; appraisal certificate
A document certifying the authenticity, quality, or value of an item, especially in contexts like art, antiques, or swords.
This sword comes with a certificate of authenticity.
When buying antiques, it's better to check the appraisal certificate.
Full standard spelling.
Rare abbreviated variant.
Abbreviated spelling; less common but still used.
Variant with 書 instead of 書き.
Compound of 極め (kiwame, 'determination, judgment') + 書き (kaki, 'writing'). The exact historical derivation is uncertain, but the term likely originated in traditional appraisal contexts.