A Reddit post was made early agust by u/moutainofmoo in the r/chefknives community asking for a knife identification. Subsequent comments showed that the knife was bought off eBay for fun.
Regardless, the knife bares kanji resembling that of Shigefusa, ableit difficult to intepret. Nonetheless, this remains a fake Shigefusa.
Why this is a fake?
This post comes from James' Knives & Stones Instagram
account.
The video displays a kasumi deba performing a sharpness test. In the comments, James notes that "Single bevel kasimi shigs should have a stamped kanji, rather than engraved. This shigs are largely unbranded single bevels (possible made in Japan, but rather low grade), and have the kanji engraved. The Kanji quality is very high."
I would add to these comments that several other attributes are missing or off: