What you have is a "raising hammer."

http://
www.bing.com/images/search?q=Raising+Hammer&Form=IQFRDR

> A couple of tools have come my way that could use some identification.
> First is a hammer of unusual shape. The head has a maker's mark which
> is an arrow that appears to go through a circle. The opposite side is
> stamped "Germany". This came from an industrial arts suite in a
> decommissioned school. I was wondering about the use of such a hammer
> and the maker, if possible.