The BladeForums.com 2024 Traditional Knife is available! Price is $250 ea (shipped within CONUS).
Order here: https://www.bladeforums.com/help/2024-traditional/
D2 can have an Orange Peel look when polished. Might try a vinegar soak on that "440C" to see if maybe you got D2 by accident.
Btw, does 1075 take a hamon? I thought it took a carbon level like 1095 to achieve, but I could very well be wrong.
Its not the carbon level but more the carbon steel without a bunch of stuff in it. Any of the simple carbon steels will hamon from 1050 or so on up, its just a matter of what levels of manganese and chromium and other stuff they have in them to affect the depth of hardening. 1075 from aldo makes some very nice hamons, as does his 1095.
Manganese below 0.5 generally will allow a hamon. More alloying will decrease the hamon potential. I have got some great accidental hamons from Aldo's 15N20.