It looks like yours have been rubbed off.
Thanks much for the info! Any idea as to when they switched over from printing to moulded?
At any rate, this made me go and remove ALL their hair piece to take a peek inside each clicky's head; here the report:
5 of the complete faces are moulded eyes/mouth (you can see the 2 tone plastic inside)
4 of the totally blank faces do not have the 2 tone moulded plastic
6 of the partial faces HAVE the 2 tone moulding, but the dark brown plastic never made it thru (ie, eye/mouth voids in face missing)
I also popped off a couple of chrome-body clickies I have, and they don't have 2 tone plastic on the inside (ie, printed on eyes/mouth). Learned something new!
p.s. - added pic of klicky's head interior