Tanto signed GASSAN with)Day and Night double-faced scabbard Aikuchi Tanto Fitting

Koto Early Muromachi period (Eikyo era circa 1429-) Dewa
Length of cutting edge 19.5cm Inward curvature Width of base 17.2mm Thickness of base 5.1mm

NBTHK(Hozon) certificate

with)Day and Night double-faced scabbard Aikuchi Tanto Fitting

Blade construction: Hira-zukuri Tanto, Iori-mune in low. Width on base is a bit on shallow side and an inward curve where upper Fukura area is less swelling. The entire shape creates classical grace of 15th century.(click HERE for higher resolution image of the entire blade)
Forging(Hada): Forging is conspicuous AYASUGI (curved) in order. The surface shows moistened beauty of old elegance impression with fine Nie sparkling glitter and mottled Utsuri reflection in sympathy with AYASUGI forging pattern.
Temper(Hamon): Temper starts at upper the Hamachi "Yakiotoshi" fine Nie hard metal granules, shallow undulating indication, mixed with small Gunome with various indication in an archaic style. Temper edge is active with curved mark of Kinsuji threadlike area which is corresponds to AYASUGI curved Chikei forging marks against sparkling Nie granules. The interior of temper contains full of mist-like crystalline area to add thick lines of "Kinsuji" and short lines of "Sunagashi" Nie brushing indication.
Temper of tip(Boshi): Temper of tip is wide and strong hard metal granule base, irregular Midarekomi with double or brushing indication then medium circle turns back deeply.
Tang(Nakago): Nakago is in UBU original. Shallow slanting left file marks. One peg hole of Mekugiana. Double-bevelled (Kurijiri) heel shape. Back ridge of Nakago is flat. The inscription signature is two character that reads GASSAN 月山.

In 12th C., ancient sword makers in Oushu 奥州, another name for Mutsu Province of Northern area had developed since Heian period. Mogusa 舞草 or Houju 宝寿 lineage had prospered in Hiraizumi 平泉 area under the patronage of Northern Fujiwara noble family.
Ultimately they were conquered by the Kanto Samurai clans led by Minamoto no Yoritomo 源頼朝.
In Muromachi period, the GASSAN 月山 sword makers occurred under the patronage of Shugendo group 修験道 who had faith in Mt. GASSAN 月山. Their main workshops would be Sagae, Yamagata 寒河江・谷地. GASSAN lineage had been prospered mostly in Muromachi period but suddenly disappeared on after Sengoku period (end 16th C.).
GASSAN AYASUGI-established tradition had revived by Gassan SADAKATSU 月山貞勝 after two centuries in Settsu(Osaka) domain then matured by the famed smith Gassan SADAKAZU 月山貞一 and present day the 2nd generation of Gassan SADAKAZU 月山貞一 who is a holder of an important intangible cultural asset on Showa 46 (1971).
The subject Tanto "GASSAN", aged on about 15th C.(Eikyo era-), blimming over with AYASUGI(curved) forging marks and overflowed with rich quench activities such as sparkling Nie granules and thick lines or curved thread-like area that glitters in a misty-crystalline area. The shape is created in an archaic style with full of classical grace and quench starts upper the Hamachi (Yakiotoshi) that still shows the long-established tradition since 15th C.

with)Day and Night double-faced scabbard Aikuchi Tanto Fitting
The top quality mounting is AIKUCHI-style, with buffalo horn work of kashira, Fuchi, Koikuchi, Kurikata and Kaeri-tsuno. The scabbard is powder of malachite and an eggshell coating, double-faced lacqured with Janome and Tsuta emblems in Makie technique. White Ray-skin hilt work, Menuki ornament is a pair of dogs to pray for a safe birth and easy delivery, wrapped in golden brown Hiramaki-style silk cord. (click HERE for the other side and HERE for Dog Menuki)
Good old polish, Condition scale: very good (using a scale of mint-excellent-very good-good-fair-poor).
This GASSAN tanto gives you honor of rich activity scene that comes from traditional steel forging and quench technique plus enjoyment to possess the good-luck charm Koshirae fitting for a safe childbirth.
Silver ground Habaki collar. preserved in Shirasaya plain wood mounting.
reference data:
Honma Junji/Satou Kanichi, NIHONTO TAIKAN KOTO-HEN 3 Otsuka Kogei sha, 1969
Honma Junji/Satou Kanichi, SHIN-NIHONTO KOUZA Yuzankaku, 1970