ayakokusuzawa

I rolled the billet down to this thin sheet.

I could see the centre of this billet is fused through the cut surface.

So I started punching on the back side for making pattern (This time I punched letters).  At this stage, the letters were not clear to see.

I rolled it down, punched it, and sanded its convex surface.  I repeated this process more than 4times… and finally, the letters turned into visible…

…like this.