B627.   Yasutsugu Taikan by Dr. Sato.  1960. Clothbound with slipcase, 10 ¼ x 14 ½”, 514 pages in Japanese.  Huge, beautiful, very hard to find book.  Hundreds of oshigata and photos of  swords of the Yasutsugu group, and examination of signatures and crests carved above the mei.  This is a great reference.

The slipcase (which is not the one in my 1st picture) is a bit soiled and rubbed at corners, although it still serves well to protect the book.  The title in gold lettering on the spine of the book is mostly gone.  The book itself is in fine reading condition.  8 pounds, 11 ounces. $350