The text isn't that helpful, but the illustrations are good and include many pieces not published elsewhere. 1978 Wakayama's big three volume set of signature photos. The most extensive available. A must for anyone collecting signatures. Includes an English translation.
Rumors say that it has resurfaced in Russia.
Has some decent early iron tsuba, followed by a lot of kinko. One of the few recent books out. The Sword Fittings museum in Sugamo puts out very nice illustrated catalogs of its exhibitions. There are over 15 of them out at this point. This is the most complete glossary on swords and fittings, with pictures and English translation.