This is an impressive hammer incorporating a battle raven.
It looks modern, but is a very close copy of one found in Kabara, Scania.
The back of the Hammer is plain, and it’quite flat. The opening is just over a tenth of an inch, so it will take a 2.5 or 3 mm chain. If you want to use a a heavier chain or thong you could take it to a local jeweler and have them add a ring. (1.14″H by 1.09″W)
Sterling silver with cord.