This is a tricky one, and I could be completely wrong! My first impression was that this seems a very nice helmet. However, after comparison of similar helmets on weitze.net I don't trust the wappen because FR is not present on the chest of the eagle, which ought to be the case. However, I could be completely wrong here. On the positive side, there is a return policy and if the helmet is truly authenthic the price is also reasonable.
Best regards,
Edwin