The finds

Expect rapid patina formation on this reactive carbon edge during initial use, requiring prompt drying to prevent active rust. Typical money for 東周作 runs near $120 across 6 comparable asks, which puts this $52 asking under the market.

Expect reactive carbon steel surfaces to develop a dark patina quickly with regular use. Fairly priced by the name's own market: Motokane runs about $87 across 6 comparable asks, and this asks $72.

The prominent cladding line and surface staining indicate a reactive soft iron jacket over carbon steel core construction typical of traditional kasumi deba knives. At $110 this Masamoto KS trades right around its $121 norm by its researched range.

Expect reactive carbon steel behavior requiring prompt drying to prevent surface discoloration during deba work. The $156 asking sits close to the $157 that 東周作 typically brings across 5 comparable asks.

Carbon steel takes a very fine, aggressive edge easily but will develop a patina and requires careful drying to prevent rust. At $153 this Sakai Takayuki trades right around its $164 norm across 9 comparable asks.

Expect rapid patina formation on this exposed carbon edge during heavy fish butchery. $167 lands within the normal $167 range for 東周作 by its researched range.

Expect rapid patina formation along the exposed carbon steel edge and bevel during initial use. Fairly priced by the name's own market: Motokane runs about $90 across 8 comparable asks, and this asks $89.

Against the $320 that 丸尾山砥石 (Maruoyama Toishi) typically brings by its researched range, the $183 asking reads cheap.

Expect rapid patina formation on this bare carbon core steel during initial use, demanding prompt wiping and drying after cutting acidic ingredients. The $178 asking sits close to the $172 that 東周作 typically brings by its researched range.

Polished stainless steel resists corrosion well and requires minimal upkeep compared to traditional carbon alternatives. The gap runs in the buyer's favor: $68 asked, roughly $103 typical for Seki Magoroku across 10 comparable asks.

Single bevel carbon steel requires careful waterstone alignment on the flat ura side to maintain proper geometry. Sukenari (per the title) at $170 is in line with its market, roughly $187 typical by its researched range.

Used carbon steel requires careful rust prevention and regular oiling despite its patina. The $129 asking sits close to the $120 that Kanetsune typically brings by its researched range.

Carbon steel requires prompt drying after food prep to prevent oxidation and staining on the primary bevel. This Masamoto Sohonten asks $237 where the name's market sits near $317 across 7 comparable asks.

Pitting and rust near the edge require abrasive thinning and flattening to restore proper bevel geometry. $175 lands within the normal $198 range for Masamoto Sohonten (per the title) across 7 comparable asks.

Expect patina within weeks on this bare carbon edge, which protects the steel once stabilized. No real gap here; Motokane typically fetches $119 across 7 comparable asks and this lists at $124.

Mono steel blades lack cladding layers, maintaining consistent hardness across the entire cross section as they wear. At $97 this 濃州正宗作 (Noshu Masamune Saku) trades right around its $97 norm across 8 comparable asks.

Expect reactive patina to develop quickly along the exposed carbon core road of this single bevel blade. The $60 asking sits close to the $62 that Seki Magoroku typically brings by its researched range.

Honyaki differential hardening creates a rigid single-material blade that demands expert sharpening skill. $531 lands within the normal $554 range for Minamoto Akitada (源昭忠) by its researched range.

A good condition carbon steel blade may show minor patina from prior use but remains structurally sound. This Masamoto Sohonten (per the title) asks $197 where the name's market sits near $318 across 7 comparable asks.

Active edge chips, pitting, and thinning from sharpening demand extensive grinding to re-establish a functional bevel. Market rate, more or less: $61 asked against the $66 that Aritsugu Kyoto usually sees by its researched range.

Mono construction means the entire blade consists of a single uniform alloy layer. At $236 this Sukenari trades right around its $219 norm by its researched range.

San-mai carbon construction requires careful drying along the soft iron cladding boundary to prevent red rust. Motokane (本兼) at $175 is in line with its market, roughly $145 typical across 6 comparable asks.

Left-handed san-mai construction requires specific bevel orientation during sharpening to preserve performance. Seki Magoroku generally trades near $98 across 10 comparable asks; this listing wants $70.

Stainless san-mai construction offers corrosion resistance on the outer cladding while simplifying routine maintenance. This Seki Magoroku is priced where its market lives, $108 against a $108 typical across 10 comparable asks.