I have a vintage Estwing hammer, once my grandfather's, then my father's, now mine. I've had it for years, and though I actually have a couple of other hammers in my tool box, this one is my favourite by far. And now I know why! According to CL:
"Swedish immigrant Ernest Estwing was a self-taught engineer who started as a six-cents-an-hour machinist before eventually striking out on his own in 1923. His big idea: Hammers forged from a single piece of steel would be stronger than the traditional wood-handled models. He developed prototypes in his garage and then patented his 'unbreakable' design."
Tool shown: Estwing sportsman ax with leather grip.
You can still get Estwing tools today. A brand-spankin'-new Estwing Leather Claw Hammer (English Pattern) costs about $30 and looks like this: