With only the one view to make a guess, I would have to say that
it is a tailpipe cutting tool. The handle is to keep yer hand in the
safety zone. I also would be guessing that it is an almost useless
item, since there is hardly any room to work on the exhaust sytem
especially when swinging a hammer. I would opt for an air chisel any
day. (not trying to belittle your find)
Uncle Bob