This hammer is made from a desciption I once got, I was a bit surprised over how compact it got, but it actually serves it well.

This was also my first try at making a face on something.

The hammer is shown in silver, but can also be made in bronze or gold, it´s about 35mm high, weighs about 32 gram and has a 4mm hole through the head for the chain.

Example with hammer on a thin byzantine chain