Translation:

The main kanji reads:

正広作 — Masahiro Saku

Meaning: “Made by Masahiro” or “Masahiro made.”

The smaller characters above appear to say:

登録商標 — Registered Trademark

So the full marking is basically:

Registered Trademark — Made by Masahiro

This appears to be a vintage Masahiro Japanese chef/utility knife with a carbon-steel-looking patina and a wood handle.

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eBay Title:

Vintage Masahiro Saku Japanese Chef Knife Carbon Steel Wood Handle Japan Kitchen Knife

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eBay Description:

For sale is a vintage Japanese kitchen knife marked 正広作, which translates to “Made by Masahiro.” The smaller kanji above the maker’s mark reads 登録商標, meaning “Registered Trademark.”

This knife has a slim chef/utility profile with a pointed tip and a traditional wood handle. The blade shows a natural dark patina, age marks, scratches, and signs of previous use, giving it a great vintage look. The edge is present and the knife would make a nice user, restoration piece, or addition to a Japanese knife collection.

Approximate details:

Blade length: about 6 inches

Maker/marking: Masahiro Saku / Made by Masahiro

Origin: Japan

Handle: Wood handle with rivets

Condition: Vintage/used with patina, scratches, wear, and discoloration from age and use

Please review all photos carefully for the best idea of condition. This is a vintage knife and may need cleaning, sharpening, or restoration depending on the buyer’s preference.

Great piece for collectors, restorers, or anyone who appreciates older Japanese kitchen knives.

This is a FULL RESTORATION!! The handle was destroyed and I replaced it with a beautiful spalted hard maple and secured it with brass pins. The knife is gorgeous.