Kamisori and straight razor are different things, but some Japanese straight raozrs and Iwasaki Kamisori have single bevel kamisori style straight razors.
I have seen those mixed razors in Tosho, and Tomobo, and some other makers.
I have also seen the same style in Iwasaki razors sometimes, but I was not sure what they had made by Iwasaki or someone else had modified it from original kamisori.
However, I saw the same style blade recently in new condition, and I saw the same style blades at Iwasaki factory, so they had made by Iwasaki (single bevel kamsori with straight razor shank and tang).
https://www.aframestokyo.com/iwasaki-tamahagane-45mm-hh-straight-razor-made-by-shiozawa-tadaa45.html
https://www.aframestokyo.com/iwasaki-tamahagane-45mm-ff-straight-razor-made-by-shiozawa-tadaa45.html
