I have a similar in the green house --- currently made and sold

https://www.amazon.com/Barebones-Japanese-Stainless-Resistant-Finished/dp/B09QQ9
19J9/ref=sr_1_3?crid=DPLLW4G762KW&keywords=japanese+nata+tool&qid=1660915440&spr
efix=Japanese+nata%2Caps%2C338&sr=8-3&ufe=app_do%3Aamzn1.fos.006c50ae-
5d4c-4777-9bc0-4513d670b6bc

(Amazon search on Japanese NATA will get you lots of choices of similar but
different blades)

Ken in Juneau