Mike, the image on the left is 12/67 and the one on the right is 12/64. Sorry, I guess I just added another one for you to look for
Chris, mine came from the original owner and he did not recall an additional letter, but there certainly could have been.
I like those Christmas cards too...especially the ones that have the entire team photo and facsimile autos. Would love to have the one with the 52 Team photo inside. Do you have that one?