I own the 101-layer damascus nakiri, which is available in this drop, but the specs don't provide any details. For the record, that nakiri has a 1.1425 German steel core. (It's printed on the left side of the blade.) That steel is very similar to 440C. Zhen claim a hardness of 62 HRC, which is unusually high for that steel (but achievable with careful tempering).
The knife is very sharp out of the box, no issues. Fit and finishing are OK, but not great. The rivets stick out just a fraction above the surface of the wood, as do the bolsters; you can just feel a slight step up from the wood to the metal. The knife has a full tang, and the wood for the handle is attached to it in two halves. There are small gaps on my knife where the wood meets the bolster (on one side only),
Because of the full-tang construction, and because the blade is not all that thin (2.4 mm near the bolster, 2.2 mm near the tip), the knife is heavy for a Japanese-style nakiri: exactly 250 g. For comparison, another nakiri that I own, a Sakai Takayuki 165 mm with AUS-10 hammered damascus blade and rosewood Wa handle, weighs 146 g and can be bought for the same price.
If you don't mind a heavy knife, and if your are not anal about minor fit and finishing flaws, the damascus nakiri is good value. But be prepared to use your muscles when using it. I definitely wouldn't recommend it for extended prep sessions.