细节
A YAMATO KATANA
REGISTERED AS A TOKUBETSU JUYO TOKEN [EXCEPTIONALLY IMPORTANT SWORD]
Unsigned, Traditionally Attributed to a Member of the Taima Line of Smiths, Late Kamakura Period (14th Century)
Sugata [configuration]: shinogi-zukuri [longitudinal ridge], chu-kissaki [medium point], iori-mune [shallow peaked back]
Kitae [forging pattern]: itame [wood grain] with some elements of mokume [burl grain], with strong jinie [hard metal granules over the surface of the blade]
Hamon [tempering pattern]: a combination of suguha [straight line] with gunome [small pointed curves]and ko-ashi [short lines projecting into the hardened edge], sunagashi [thick lines of nie], nijuba [double edge to the temper line], with strong nie [hard metal granules] and clear nioi [mist-like crystalline areas]
Boshi [tip]: yakizume [with no turnback] with slight hakikake [brushed tip]
Horimono [carvings]: a single bohi [groove] on each side continuing down to the heel
Nakago [tang]: osuriage [substantially shortened] with replacement shallow katte sagari yasurime [diagonal file marks sloping towards the back of the tang], two mekugi-ana [holes for retaining pegs], the heel cut off at right angles
Fitted with a two-tier gilt habaki [collar]
Shirasaya [plain wood scabbard] with attribution to Yamato Taima by Honma Kunzan, dated 1976
Black-lacquered katana koshirae [set of mounts] comprising: black-lacquered saya [scabbard] with aoi-mon [hollyhock crests] of the Tokugawa; tsuka [hilt] covered in sharkskin and wrapped in white silk forming a lozenge pattern; shakudo [copper-gold alloy] chirimen [crinkled ground] kashira [fitting at the end of the hilt and fuchi [hilt collar] worked in relief iroe [soft-metal decoration] with aoi-mon; black-lacquered horn koikuchi [scabbard mouth]; shibuichi [copper-silver alloy] kojiri [scabbard butt] engraved and gilded with aoi- mon; shakudo nanako [granulated ground] tsuba [hand guard] with a gold rim, worked in gold iroe [soft-metal decoration] with scattered aoi-mon, diameter 3 1/16in. (7.8cm.); and shakudo nanako kozuka [knife] and kogai [skewer] similarly worked, with white silk hilt binding, Edo period
Overall length of blade: 35 9/16in. (90cm.)
Nagasa [length from tip to beginning of tang]: 27 5/8in. (70.2cm.)
Sori [curvature]: 11/16in. (1.7cm.)
Motohaba [width at start of tempered edge]: 1¼in. (3.2cm.)
Sakihaba [width before tip]: 7/8in. (2.2cm.) (2)