I would like to thank our Forum's own CC/Cutlass Collector for his monumental page on boarding axes in helping me identify this piece. CC, your resource is really the best I found online or elsewhere, so unless there is an old moldy copy of a book on entrebil written in Swedish somewhere, you ARE the source!
Here is an attachment-
https://www.boardingaxe.com/
http://www.vikingsword.com/vb/showth...avian+boarding