Found a few mystery hammers.
(http://i.imgur.com/bTDm7De.jpg)
(http://i.imgur.com/NK8aCUS.jpg)
I thought the big one might be a tire bead breaker hammer, but it doesn't look quite like the images I found. The other ones, I have no idea.
The small one with the notch and hole looks like it would be used to set teeth on a crosscut saw.