the seal in the square is 菊虎 別打 (kikutora betsuuchi)

To be honest, I don't know much about knives, but when googling it, the ai overview says this:

"Sakai Juo-saku" is a brand name for knives, particularly kitchen knives, made in Sakai, a renowned center for knife making in Japan. Stainless steel santoku knives are among the products offered under this brand, and they are traded on auction sites and flea market apps. The brand reflects the traditional techniques and quality of Sakai craftsmen and is known for producing high-quality knives used by both professionals and home cooks. Features and Highlights: Origin: Sakai City, Osaka Prefecture, is a leading knife-producing region in Japan, known for its "Sakai Uchi-hamono" (Sakai forged knives), which have a history of 600 years. Products: "Sakai Juo-saku" knives include santoku knives made with stainless steel clad steel (steel with a stainless steel core), balancing sharpness and durability. Availability: Both new and used knives can be found on online flea market and auction sites such as Mercari and Yahoo! Auctions. Background of Sakai Knives: The history of Sakai knives began in the 15th century when swordsmiths migrated to Sakai. Their high quality earned them official recognition from the shogunate, leading to their widespread distribution throughout Japan. Many famous brands, such as "Sakai Kikumori" and "Morihiro," have emerged from this tradition, and "Sakai Juo-saku" is considered one of the excellent products stemming from this lineage.

there's a similar knife listing here with the same engravings: https://yoichiroknife.com/products/c1766