A41667(S2150)
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Katana signed Mino Izumi-no-kami KANESADA-saku Auspicious day, in the 5th, the 2nd year of Meireki (1656) with) Aizame sharkskin black lacquered polish scabbard Tachi style koshirae

Shinto early Edo period (the 2nd year of Meireki/1656) Bushu
Length of cutting edge73.3cm Curvature1.6cm Width of base31.8mm Thickness of base7.6mm Width of Yokote20.8mm

NBTHK(Tokubetsu Hozon) certificate

with) Aizame sharkskin black lacquered polish scabbard Tachi style koshirae

Sugata(configuration) : Long katana. Shinogi-zukuri, Iori-mune. Mihaba is wide on base, extremely thick in Kasane and there is massive volume in Hiraniku. There remains almost full of temper edge at cutting side (Ha-machi). There is moderate curvature leading to a middle tip. The blade is heroically made and quite heavy on hands. 
Kitae(forging pattern) : Kitae-hada is clear Itame-hada (wooden grain) of which Hiraji surface is covered in sparkling Ji-nie that generates darkish Nie lines so called CHIKEI activity. The blade steel is vividly clear and bright.
Hamon(tempering pattern) : Temper is Ko-nie glitter based. It starts with short and straight Yakidashi then becomes clove shape outline of which head is round or square indications, some shows Togari (sharpened) or Yahazu(notch of an arrow) shape. In the interior of temper, there works with floating You(dots). Upper Monouchi area in front, shows brighter Nie glitter that gives off vividly clear light and abundant Nie activities such as Yubashiri (temper streams in Hiraji surface) or Sunagashi (darkish Nie blushing lines) like a river flow. There are small Muneyaki temper spot upper Koshinogi area and a temper dot on the lower back.
Boshi (tip): The temper of tip forms straight regular line, medium circle turns back that almost connects to a Muneyaki temper spot.
Nakago(tang) : Original UBU with one mekugi-ana retaining hole. Takanoha (V-shaped) file marks. Ha-agari Kurijiri (Double-bevelled) heel. The signature in front is large character that starts from the place of birth 《Mino》 and the official rank title 《Izumi-no-kami》 and the smith name 《KANESADA-saku》. The reversed side is chiselled the date of year in medium character 《Auspicious day, in the 5th, the 2nd year of Meireki》 (1656).
The sword smith Izumi-no-kami KANESADA in 2nd generation who worked under the patronage of Saito clan is to say [No-Sada] as one of the two greatest Mino sword smith along with KANEMOTO during the Warning States period. He was the first sword smith to enjoy an official district Izmumi-no-kami title granted by the Imperial Court and won the praise of major Samurai warriors, not only because of the best cutting performance but also the beauty of swords. His sword has been treasured by noble Samurais for generations and successors of Kanesada family smiths were spread to the major castle towns during Edo period. This would be one of the major reasons why many of sword smiths during Edo period shows technical skill of Mino school.
This heroical katana was made by the legitimate successor who had moved to Edo, Bushu province, observing the transmitted heirloom such as V-shape filemarks and Ha-agari Kurijiri (Double-bevelled) heel shape in the hilt. Also it's temper pattern displays close resembles to the work of [No-Sada] in his early period during Meio-Bunki (1492-1503) era before he enjoyed Izumi-no-kami title.
Black lacquered Aizame sharkskin polish surface scabbard Tachi style Koshirae consists of:
Shibuichi copper alloy ground Wrinkled-leather-skin engraving pattern metal furniture, Gold Iroe inlay for Kabuto-kane,Ashi-kanamono,Ishitsuki.
Shakudo copper alloy Nanako-ji surface a pair of Dragon Taioko-kane and a pair of Yagura-kane.
Pure gold a pair of Dragon Menuki metal ornaments.
Shibuichi wrinkled-leather-skin engraving Tsuba with swallowtail butterfly (Ageha) family crests of cross rectangular openwork plus four swords shape.
Silver ground gold plated KIKU flower petals shape a pair of large Seppa spacers and small KIKU petals a pair of medium Seppa.
Incense color gold brocade wrap hilt, Unohana cream color Hiramaki tachi style lozenge silk cord.
This katana is near mint-excellent, museum conserved condition with the original precious Tachi koshirae and is renowned as one of the best works of KANESADA in Shinto period and it's easy to guess that the noble Samurais had been treasured for generations.
Single layer gold foiled Habaki collar, Preserved in Shira-Saya mounting.