A Japanese Tachi in Shirasaya, Mumei, 15th Century or Later日本 十五世紀或更早 無名 白鞘太刀 Nagasa (length of tip to beginning of tang): 34.3 in (87 cm);Motohaba (width at start of tempered edge): 1.2 in (3.1 cm);Sakihaba (width before tip): 0.8 in (2.1 cm);Tang unsigned, overall length 48.5 in — 123.2 cmEstimate: $800—1,200