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重房 Shigefusa
Seen in person mei
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MakerShigefusa (Kairo Iizuka)RegionSanjo, Niigata (Tsubame-Sanjo)
Marks重房SteelsShirogami #2
Knife types madeDeba, Yanagiba, Usuba, Nakiri, Santoku, Chinese cleaverMain useBreaking down whole fish: heads, bones, filleting. Thick spine.
Recommended whetstone1000 → 3000–6000 JIS · how to sharpenMaintenanceRinse and wipe dry immediately after each use — never leave it wet or in the sink.
What this mark means
重房 reads Shigefusa. It is a chiselled or stamped kanji signature (mei) used by Shigefusa (Kairo Iizuka) (重房（飯塚解房）), Sanjo, Niigata — the Tsubame-Sanjo region. Seen on an ayu-kogatana in the Nakajo Kanamono showcase.
About the maker
The most sought-after Sanjo mark overseas. Forged with visible 鍛地 (folded-steel texture); official retail ¥37,400–347,600 but orders are suspended and back-orders take years. Steel is described only as 鋼と軟鉄 (steel + soft iron) — the 'Swedish steel' claim seen on forums is not in the maker's own material.
Products carrying this mark
- 重房 — 出刃 / 柳刃 / 薄刃 / 身卸 / 菜切 / 三徳 / 中華 / 鱧切 / ふぐ引 / 鰻裂