I still remember the day when I went to kyoto and Tokyo to buy stones from reputable stores.
After payment, I was shown a draw of stamps and asked what I wanted it to be stamped with .. that was the day I started to ignore the stamps on stones
The knife has the kao as the last kanji of the 5. You may have gotten it from elsewhere but Morehei is definitely the original source of it. (alot of place buy it from Morehei and then resell it .... e.g. hitohira, yahoo auctions, etc)
Kato only adds the kao for Morehei. It is 100% standard and...
It’s a 130mm ajikiri/kodeba. Good for small things like mackerel.
Would be too small for any thing bigger than that.
kasumi ajikiri are not very common but it isn’t cheap either. You can find kasumi 150-180mm deba in this price range too from shigefusa