User blog comment:Kogath/Monster Hunter Frontier G7 Discussion/@comment-5950847-20150428150056/@comment-4731324-20150428190226

That's the design winner from http://www.famitsu.com/sp/mhf/buki_design2014b.html. You have to purchase the Famitsu magazine with the event codes for this hammer in order to get it.

Seen a few people wandering around with it on their lobby sets. I had forgotten it was part of the contest and thought it was a sword at first.