Field Kotanto w/Antique Fittings

$1200

A 112mm hammer-forged kotanto blade with Edo period fittings.

Out of stock

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Description

The core of this project is a charcoal-forged blade, water quenched with clay and sharpened with waterstones, an outdoor knife that has the foundation of the Japanese sword. The blade with antique components is ready to be mounted as an outdoor knife in kura takedown style.

Satoyama are the managed forest areas that border the cultivated fields and the mountain wilds in Japan. Historically they provided soil nutrients, firewood, edible plants, mushrooms, fish, and game, and supported many local industries and crafts such as farming, timber construction, and charcoal making. The interaction of forest, arable land, wetlands, and streams are an important component of the satoyama landscape.

Island Blacksmith: Charcoal forged knives from antique steel.

Forged from an antique rail coupler, the blade profile of the field style kotanto is based on a kamakura sword and has more pronounced belly and wider blade. The temper of this high carbon steel blade has been left relatively hard in order to hold a keen edge. This particular combination of steel and heat treatment is well suited to users who require a good edge and are willing to take care of it.

Island Blacksmith: Charcoal forged knives from antique steel.

Island Blacksmith: Charcoal forged knives from antique steel.

Island Blacksmith: Charcoal forged knives from antique steel.

The tang is constructed in a similar manner to a Japanese sword requiring only a single bamboo peg to hold the knife assembly together. In addition to the sense of beautiful simplicity, this design allows the knife to be taken apart for cleaning, polishing, detailed cutting tasks, or major resharpening work.

The antique fittings came from the collection of a sword restorer and are likely Edo period (~1600-1800) but may be older. The large copper habaki was originally from a katana and is of double construction with a separate jacket, a style generally reserved for valuable and older works. Because of the size of the habaki no seppa (blade washer) is required.

The delicately crafted antique fuchi (ferrule) is carved from shakudo (copper/gold alloy) and has a motif of chiseled/inlaid/overlaid gold hyotan (gourd) vines and leaves against a backdrop of carved pine needle texture. (H38mm x W22mm x D12mm)

The well-crafted kashira (pommel) in shakudo (copper/gold alloy) has the motif of gold roofed pavilion (probably the pagoda in gion, kyoto), rooftops, and treetops under clouds and inlaid shibuichi (copper/silver alloy) moon, accented with delicate katakiribori chisel carving on the sides. (H34mm x W17mm x D9mm)

Island Blacksmith: Charcoal forged knives from antique steel.

Island Blacksmith: Charcoal forged knives from antique steel.

The blade is just under 4.5″ long with an overall length of 7.75″. The sturdy spine is about 7mm thick at the munemachi. The edge has been taken down to between 1/2 and 1/4 mm but still has plenty of ha-niku (“edge meat”) and needs final bevel and sharpening work. The unhardened tang is not yet drilled, the general location can be marked if requested.

Specifications

長さ/刃長 Nagasa (blade length): 112mm
重ね/元重 Motokasane (spine thickness): 7mm
元幅 Motohaba (blade width): 29.5mm
反り Sori (curve): muzori (straight)
中心/茎 Nakago (tang length): 85mm
柄長 Tsuka (handle length): none
拵全長 Koshirae (overall): none

形 Katachi (geometry): hira-zukuri, iori-mune
刃文 Hamon (edge pattern): suguha
帽子/鋩子 Boshi (tip pattern): ko-maru
中心/茎 Nakago (tang): futsu, kuri-jiri, no mekugi-ana
銘 Mei (signature): mumei (unsigned)
拵 Koshirae (mounting): none (parts included for kura style aikuchi mount)

Materials: 1912 rail steel, antique copper habaki, shakudo fuchi and kashira

Suggested finishing materials: hardwood handle (zelkova, sapele, walnut, elm, magnolia), bamboo peg, magnolia (hounoki, tulip tree, tulip poplar) scabbard

This piece is in a private collection in California.


Process

This blade was forged and underwent yaki-ire at the museum forge.

Island Blacksmith: Charcoal forged knives from antique steel.
This section of rail coupler has the date 1912 on it.
Island Blacksmith: Charcoal forged knives from antique steel.
The small but thick corner piece from the coupler foot will become the blade.
Island Blacksmith: Charcoal forged knives from antique steel.
A comparison of the billet after wakashinobe (lengthening) next to the original place it was cut from.
Island Blacksmith: Charcoal forged knives from antique steel.
The sunobe (rectangular blade preform) before beginning hizukuri to forge in the bevels.
Island Blacksmith: Charcoal forged knives from antique steel.
The peaked spine is forged in first, followed by the bevels.
Island Blacksmith: Charcoal forged knives from antique steel.
After the final heat for the forging stage the steel will be heated evenly to normalize.
Island Blacksmith: Charcoal forged knives from antique steel.
Forging the bevels is complete, a small amount of filing around the edges will clean up the profile.
Island Blacksmith: Charcoal forged knives from antique steel.
Preparing the mixture of charcoal, clay, stone powder, and water.
Island Blacksmith: Charcoal forged knives from antique steel.
Applying the clay mixture which will control the cooling rate of the main part of the blade.
Island Blacksmith: Charcoal forged knives from antique steel.
Drying the clay mixture over the forge while warming the water in preparation for yaki-ire.
Island Blacksmith: Charcoal forged knives from antique steel.
Immediately after quenching, the edge is very hard but the rest of the blade remains tough.
Island Blacksmith: Charcoal forged knives from antique steel.
The clay is removed from the blade and hardness checked.
Island Blacksmith: Charcoal forged knives from antique steel.
Removing some of the fire scale using part of a repurposed natural stone wheel.

**Please note that in order to preserve the patina and texture of the antique components involved in this mounting there may be minor damage, scuffs, variations in colour, and other indications of their stories over the centuries.