Here is a little hammer series :
To start with, a Japanese style hammer. It is mainly intended to be used with my Japanese chisels, so I didn't plan any heat treatment for the head.
The handle is from nice straight grain ash. As an exception, it is not wood turned, I shaped it with my spokeshave in the Japanese style. Oil finish.
The head is round turned out of C35C steel stock. It is 35mm diameter, it weights 600g.
The mortise for the handle was milled on my lathe, using my milling square mount.
The head has one rounded face and the other is flat.
An ebony wedge for locking the head.