I've never seen a hammer like this, what is it used for

Image is taking forever to load on  my computer. I think what you are looking at is a top swage and not a hammer. These are often used to true up joints in combination with bottom swages.

 

Looks like a screen shot from here possibly, so maybe someone can link the original picts.

Good Morning,

 

I can't see the pictures properly. I is a tool that is used to sharpen mine drill bits. I have one

 

Neil

Here is a link to the picture. I don't know what happened to the first upload

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swedefiddle is correct. It's a top tool for dressing stone drills.

Though you could use it for decorative rosettes if you had the appropriate press or hammer to use it with