The center of the the block is the Eight Point Star which we have made previously. The pattern is available in Electric Quilt as Rolling Star. It is shown as a square block which is actually how it needs to be made to fit into a sampler quilt.
I think the best way to make this block at a 6" finished size would be to hand piece it just like it was originally made. I have not made it yet but think I will give it a try. Here are the templates you will need if you would like to try to hand piece it yourself.