B535.   Echizen no Kami Sukehiro Taikan by Iida.  1980.  Clothbound with slipcase, 10 ½ x 14 ¼”, 500 pages in Japanese, with biographies of the smiths in English.  Pretty much everything there is to know about the 2 generations of Sukehiro and their student Sukenao.  You get signatures in amazing detail, oshigata, photos and more: another great, large reference.

The slipcase(not the one in my picture) is fingerprinted; the book is in excellent condition. 10 pounds, 12 ounces. Now $200.