This is a book titled 'Inoue Shinkai Taikan', authored by Shinichiro Nakajima and Kazuo Iida. It is published by Token Shunju Shinbunsha and is in A4 size. The book is available for purchase.
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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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¥27,500