The features you mention are not stampable but sculpable. This, on the other hand, could be done by a bunch of pre-made forms for further reproduction.

But for my eyes, the rows deviate too much one from another, so probably a person doing it had a hollow bamboo stick to punch buttons in clay for the middle, and the top one could be done via cutting surface with parallel lines - these dots aren’t exactly round and have some angles suggesting diagonal slices. It is pretty and looks clean, and I think undividual artist did it without automating it because the process itself, for an individual foot, is not that time consuming and precise as doing faces etc.