细节
A SHINTO KATANA
REGISTERED AS A JUYO TOKEN [IMPORTANT SWORD]
Signed Awataguchi Omi no kami Tadatsuna, Early Edo Period (Late 17th Century)
Sugata [configuration]: shinogi-zukuri [longitudinal ridge], chu-kissaki [medium point], iori-mune [shallow peaked back]
Kitae [forging pattern]: ko-itame [fine wood grain] with fine jinie [hard metal granules over the surface of the blade]
Hamon [tempering pattern]: onotare [widely undulating line] with slight passages of gunome [small pointed curves], rich in nie [hard metal granules] and with sunagashi [thick lines of nie]
Boshi [tip]: sugu ni komaru [straight and then gently turned-back temper line] with hakikake [brushed tip]
Horimono [carvings]: one side carved with a kurikata [dragon and sword] the other with bonji [Sanskrit characters] and goma [parellel grooves with claw-shaped endings]
Nakago [tang]: ubu [unaltered] with sujikai yasurime [diagonal file marks descending to the right], one mekugi-ana [hole for the retaining peg], ha-agari-kurijiri [rounded heel rising sharply on the blade side], signed with a thick chisel on one side Awataguchi Omi no kami Tadatsuna [Awataguchi Tadatsuna, Guardian of Omi province] and on the other horimono dosaku [who also did the blade carving]
Fitted with a two-tier gilt habaki [collar]
Shirasaya [plain wood scabbard]
Overall length of blade: 36½in. (92.7cm.)
Nagasa [length from tip to beginning of tang]: 27 7/8in. (70.8cm.)
Sori [curvature]: 3/4in. (1.9cm.)
Motohaba [width at start of tempered edge]: 1 5/16in. (3.3cm.)
Sakihaba [width before tip]: 15/16in. (2.4cm.)