This is a book titled 'Yasutsugu Taikan' (康継大鑑), authored by Sato Kanzan. It is published by the Nihon Bijutsu Token Hozon Kyokai (NBTHK) and is in A4 size. The book likely details the works of the smith Yasutsugu.
NihontoWatch
Edo
Unsigned
We could not find an authenticity certificate on the seller’s listing. Japanese swords and fittings are normally papered by the NBTHK (or the NTHK). Without one, the attribution is the seller’s own assessment and has not been independently verified — treat it with caution and ask the dealer about certification before buying.
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¥99,000