The estwing all steel hammers are nigh on indestructible.  When I was a kid I found this hammer submerged in a marsh near a house that had been erected about a year prior.  It looked awful, but I brought it home and set it on a shelf where it continued to rust and corrode for a decade or so.  As a teen I re-found it and took it to a wire brush on a bench grinder.  I have used it ever since.  I call it the swamp hammer, and it isn't pretty but it is a really tough tool.  Thinking about it i guess its rounding on 20 years old.