hi everyone, just another nameless japanese lurker here.
So... it reads 登録 忠雄作 (touroku Tadao(?) saku/ Registered (made) by Tadao)
I'm not familier with that name so I had to look up for it.
And it looks like the knife is a cheaper side, baseline quality, soft iron / carbon steel (SK-5 steel?) forged one.
I couldn't find the details on who made it, but seems like it's by some blacksmith in Tsubame Sanjo area, Niigata prefecture.
Thanks for the information on the mystery knives.
I own a Tanaka 270mm gyuto. Really like the style of kanji he engraves. It's noticeably larger than other makers.
Was contemplating getting a yanagiba from Tanaka, but not sure how the large kanji would react to the shinogi line moving up the table of the blade from sharpening. The kanji might intersect the shinogi line. Guessing mostly a cosmetic concern, losing part of the kanji, plus this would take a while before becoming an issue.