http://www.hermann-historica.de/en/seltene_mu...rentpos=28
After some research I have found similar peaces in several museums in Europe.
I have decided to create a similar piece. The hammer had was made from an old pick axe that I´ve found in the ground when we were re-cultivating the garden.
First I have shaped it with angle grinder, adding some details with files. The hole was drilled and enlarged with files - it was quite a tedious work, because the steel was unexpectedly tough. The first picture shows hammer head with what remained from the pick axe. Second picture shows the other side.

