Well, it certainly isn't the Konica hood designed for the M-Hexanon 28/2.8 - I have one of those and it's a round, screw-on vented hood. While the rectangular hood shown kind-of looks cool, I suspect it is a lot less practical (in terms of blocking the view through the finder) than the original Konica hood. Of course, if you didn't have the original, you'd maybe try to press whatever you could get into service. Mind you, I've not noticed that the M-Hex 28 is especially prone to flare, but then I've always used it with the hood.
...Mike