On both pictures of the pontils you can see perfectly smooth surface area between the grooves that were ground to make the pontils. At least that is what it appears to look like to me. That just isn't something you would ever see on both pontils of a cane cut marble because there would have been no way for that smoothness to appear with cane still attached to at least one end. It also appears all the pontil work is below the surface of the marble. Another sign of a manufactured pontil. Of course anything is possible, and I have certainly been wrong before.