SKU: 36857615474

Kogetsu / Goko Hamono Shirogami #1 Nashiji 165mm Santoku

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Description

Kogetsu / Goko Hamono Shirogami #1 Nashiji 165mm SantokuHandcrafted by Yoshito Yamakawa, this Santoku features a Shirogami #1 steel core, clad in stainless steel with an elegant Nashiji finish. The blade is heat treated to 62 63 HRC, which ensures pretty good edge retention; and the fit and finish is decent for its price. Measuring just 2. 8mm at heel and 1. 8mm in the middle of the blade, the exceptionally thin behind the edge and the beautiful distal tapering allows the knife to deliver a smooth cutting

Handcrafted by Yoshito Yamakawa, this Santoku features a Shirogami #1 steel core, clad in stainless steel with an elegant Nashiji finish. The blade is heat-treated to 62-63 HRC, which ensures pretty good edge retention; and the fit and finish is decent for its price. Measuring just 2.8mm at heel and 1.8mm in the middle of the blade, the exceptionally thin behind-the-edge and the beautiful distal tapering allows the knife to deliver a smooth cutting performance. The blade is paired with an octagonal wa-handle that's made with wenge wood with a buffalo horn kuchiwa.

Spec:

  • Origin (Made in): Kashiwa, Chiba Prefecture, Japan
  • Brand: Goko Hamono
  • Craftsman: Yoshito Yamakawa (八間川 義人) aka Kogetsu
  • Knife Type: Santoku
  • Blade
    • Construction: San Mai
    • Grind: Double-edged Blade (50/50 Grind)
    • Hagane (Core Steel): Shirogami #1 (White #1)
    • Jigane (Cladding): Stainless Steel
    • Hardness: 62-63 HRC
    • Hand-forged, hand-grinded, hand-sharpened
  • Blade Finishes: Nashiji
  • Blade Length: 165mm (6.5")
  • Blade Height (at heel): 51mm
  • Spine Thickness
    • Above heel: 2.8mm
    • Middle: 1.8mm
  • Handle
    • Shape: Hachikaku (Octagonal)
    • Material: Wenge
    • Kuchiwa: Buffalo Horn
    • Length: 128mm
  • Overall Length: 306mm
  • Weight: 127g (4.48oz)
  • Engraved Mark (Front): In Japanese Kanji "Shimosa Province Kogetsu Made" (下総国 光月作)
  • Engraved Mark (Back): In Japanese Kanji "Shirogami #1" (白紙一号)

About Goko Hamono 五香刃物

Gokou Hamono is a tiny knife making workshop located in Kashiwa City, Chiba Prefecture that is run by Norihiko Yamakawa (八間川憲彦) and Yoshito Yamakawa (八間川義人), the father and son team. Norihiko Yamakawa (the father) first founded Gokou Hamono in 1990 as a cutley wholesaler, before turning it into a knife making workshop in 1995 with the help from blacksmith Moriei Seki (関守永). Yoshito Yamakawa (the son), a high school student at that time, shadowed his father and eventually became a blacksmith himself. “Telling no lies” and “Dedication” are Gokou Hamono’s philosophy. The father and son team would not call themselves “masters”, because they think one will always have room to improve, and self-pride would hinder self-reflection. As a result, Gokou Hamono’s knives can only get better and better in the future.  Only knives made by Yamakawa-san are engraved Kogetsu Made ( 光月作)

Care:

Shirogami #1 (white #1) steel is one of the popular types of high carbon steel found in Japanese kitchen knives (Wa Knives). It is not stainless, therefore you must wipe your knife dry after each use, in particular the core steel not covered by the stainless cladding. Patina will develop over time, which will appear as “discoloration” on the cutting edge, but that is the nature of carbon steel - not a defect. The stainless cladding covers a large part of the blade, making maintenance easier but still preserving the cutting and sharpening pleasure of the Shirogami core. Avoid cutting into bones, frozen foods, hard fruit pits.

Cutting Surface:

Recommended cutting surface: wood, rubberized boards and high-end composites, and quality plastics such as polyethylene make acceptable cutting surfaces, and will help protect and prolong knife’s edge. AVOID glass, metal, countertops, and other rigid, non-forgiving surfaces.

Sharpening:

We recommend sharpening all quality Japanese knives on whetstones, as we believe they yield the best results for your knives.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
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  • Delivery to the USA:
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 36857615474

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Renee
Louisville, US
★★★★★ 5
Feels luxury, I approve
Size: King, Style: Warm
I have purchased high end comforters/duvet inserts and this one is somehow my favorite. It's so thick and fluffy. I was going to do the double duvet insert method to create an extra lush bed situation, but honestly it's not needed at all with this comforter! It poofs up wonderfully inside my duvet cover (king duvet, king insert) and it's like heaven. It's very cozy yet airy, and it moves well during the night and does not fee too heavy despite its weight. This thing is definitely on the warm end and probably won't be suitable for Florida summers, but depending on how you set the AC at night it could be fine! The comforter is weighty, it feels like quality, and has a soft fabric. I wouldn't use it without a duvet cover, that's more of an aesthetic choice but I like keeping it clean. The white is very white. Honestly, I will be getting another one simply because I'm so impressed. Definitely no need to drop $300+ dollars elsewhere.
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Reviewed in the United States on October 25, 2025
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Rosalie
Belleville, US
★★★★★ 4
ALL SEASON IS TOO WARM!
Size: King, Style: All-Season
I got the King, All Season, to squeeze into a Queen duvet for extra floof and it's sooo cozy. Highly recommend. I redacted 1 star though because although it says All Season, the amount of down in here feels like it's for winter. The first night I used it I woke up dripping in sweat. It's currently March, I live in Los Angeles area, hitting about 75° weather outside rn, but I sleep with AC full blast at night (usually hit about 64 when I wake up). I can't sleep with it, I'll need to buy the "cool" one, and hope that isn't tooo thin. Don't get me wrong, it's a great insert, but holy hell, it's too heckin' warm. I saw someone else mention it and wish I had honed in on their comment. I don't wanna return it as it was used, so I'm stuck with it now. *UPDATE* I am back because I also bought the "Cool" blanket as well after experiencing the heat of the all season and it too is also too hot for me. I've had a duvet before but I guess not filled to the capacity of these blankets. If you're a hot sleeper maybe look elsewhere?
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Reviewed in the United States on March 12, 2026
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Kingsize
Los Angeles, US
★★★★★ 5
Buy this instead of the ‘brand name’ one
Size: Twin, Style: Warm
Tl:DR: Buy it, it’s super cheap, better than the one I paid 2x the price for and soft as it can get, and it really is a ‘Winter comforter’. This review is going to sound like I got paid off for it but I actually didn’t. I bought another comforter prior to this one, paid close to double of this one and that the ‘on sale’ price, and it is trash compared to this Amazon basics one. Both claim to be thick warm comforters but I can literally stack two of the other brand and maybe they’d be almost as thick as the Amazon one. I only bought this one because the other ‘winter’ one I bought was so thin and flimsy I figured adding another ‘cheapie’ one might make me not freeze to death. As soon as I arrived I noticed that this Amazon one was WAY thicker, nicer looking, softer and warmer than the old one. Just to try it out I stacked both of them together to see if I wouldn't freeze to death like I was doing with the old ‘expensive’ one: five minutes in and I was sweating. That’s all it took, I immediately removed the duvet cover from the old one, switched it to the Amazon one and threw the old one somewhere where I couldn’t see the money I had wasted, and yes the Amazon was warmer and softer even WITHOUT the duvet cover. I’m probably going to get the light version for when fall hits and I don’t quite need the heavy one yet. Buy it you won’t regret it and hey it’s Amazon brand so if you don’t like it they’ll take care of you, but I HIGHLY doubt you won’t love this thing.
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Reviewed in the United States on April 14, 2026
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Ryan flores
Boise, US
★★★★★ 5
Great duvet insert
Size: King, Style: Light
Perfect duvet insert. I got a pretty expensive duvet to cover this and they worked great together. The fit was perfect and I didn’t feel like the duvet was smaller than its cover. This was a cheap option that keep us warm while not being too think. This product is also breathable and recommend if you live in a place that transitions from hot to cold often.
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Reviewed in the United States on April 6, 2026
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Juliane P.
Battle Creek, US
★★★★★ 5
Great mid-weight comforter
Size: King, Style: Light
Great comforter, especially for the price. I put it in the dryer for a bit when I first got it and it became nice and fluffy. Perfect mid-weight duvet.
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Reviewed in the United States on May 12, 2026

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