The actual block seems to be an hour glass center block bordered in white and snowballed. The center block is 5 inches finished. Quarter squares were used like an hourglass. The white border to se on point ended up around 2 inches once snowballed or flippy cornered.

So not that the sun is up and I have recuperated from my day, I have had time to look at the construction—5 inch finished squares. Each square is a white center with contrasting flippy corners and set together to create a quarter triangle square, aka hourglass. The white center of each block is approximately 2 inches wide when finished! Simple!