Size of mine is slightly smaller (1/16 inch difference in diameter and 2/16 inch in height), which is effectively the same size.
A signature cane showing through was probably unintentional, but as the ground is a mottled, delicate pink, it may not be surprising. That could have been something noticed in the master copy and dealt with later by ensuring the cane was set below a slightly thicker section of pink, which seems to be the case with my example. However without Willie Manson's input, my thoughts are just speculation.