I'm looking for the correct Scott number on what used to be called 66a.
Swedish Tiger says it is 66TC3 but that must be wrong. 66P3 is a plate proof on india that is NGAI and that should be 66TC3.
I have both - see below. So the question is, what is the Scott number now for what used to be called 66a?
66a certified OG:

66P3 NGAI:
