It was for sale and was sold the same week I took the picture. I do not know the craftsman personally, but he is one of several that sells his work at various viking gatherings around Scandinavia in the summer.
True, but the term viking helmet is a poor one to begin with. Viking is a verb, not the name of a people. We were called Norsemen. So 'Norse Helmet' would be more appropriate, and would encompass all Scandinavian designs, before, during, and after the Viking Age.
Actually most vikings did'nt use helms at all, it was very rare. Only the richest used it, and thats one of the main reason why only 1 viking helmet has ever been found(that and they reforged the material into other items once the helm got too badly damaged). It might also been looked on as cowardly to use a helmet, in the early viking age at least, just as chainmail.
Nice shot! As mentioned by Beardsworth, this helm resembles the one found at the Sutton Hoo burial site. That particular helmet was actually a Roman cataphract officer's reworked by Saxon craftsmen and was probably a valued trophy.