Regardless, whether it's a II or III, it should fall within the 2300-1900 range.
It came out of a bog so the flint is probably stained to give it a darker obsidian look, but the news report clearly calls it flint. Theoretically, if it is a type II or III it should be Chalcolithic (aka Early Brone Age) basically either a Beaker dagger or a people in communication with Beaker culture.
You can read about it at [Past Horizons]
|Bog Dagger with Birch Handle|
In a previous post [here], I expressed skepticism that these daggers were cheap substitutes for copper daggers.
While their form parallels the development of metal daggers, I don't know that I would necessarily call this imitation. I would rather say that style changed regardless of its material composition.
Given the long history of Danish dagger making and the difficulty of finding suitable blocks of flint, I lean toward the idea that this is a distinct tradition rooted in the Late Neolithic and one that was maintained for nostalgic and practical reasons.
Nostalgia goes a long way.