Well spotted, that is indeed a fantasy piece. That particular site is not a good place for this type of material. Reproductions and fantasy examples are common, and genuine pieces command wild money due to the auction fever syndrome that abodes.
These fantasy examples are not so common, which evidently leads some to think that they are genuine. But they are nothing in comparison to the genuine Dachau examples, such as this piece shown below, a scarce issued .50RM example.