Casting/stamping numbers. What do your eyes see?
The casting date plate get's changed every day (obviously) See the screw heads between the numbers? They are screwed into the core when the numbers are changed. The individual number blocks are machined into the plates so the number comes out exposed above the surface. Sometimes the foundry sand breaks away or sticks to the numbers and the figures get deformed when the iron is poured. This is pretty normal for an iron foundry.