Whichever way I look at the base photo, I see "H P" not "C P". But neither mean much to me.
Could you please try another photo of the base after a) dusting it with talcum powder and b) gently wiping off the upper surface, which should then leave the actual mark clearly seen.
And also, a larger photo could help - say, 500 pixels wide (as long as the Kb size is within the 125 limit).