This is a difficult tool to forge due to the huge difference in size between the square working face and the body of the tool. They could be made by forging from one piece or by forge welding two pieces together. We made one by forging it from one piece. Blacksmith Eric is shown in these pictures.
The starting size was a bar 1.25 inches in diameter. That was upset while hot until it reached 2.25 inches in diameter. That requires the difficult and repetitive work of upsetting.
The body of the flatter then needs shaping. The hammer hole is hot punched through the body.
The tool is hot filed to get closer to the finished shape. After it has cooled it can be filed to the finished shize and shape.
The flatter will be cleaned up, get a wooden handle, and be put into use.