I believe that there are about 4-5 different sizes of the lions' head.
Smallest is the Bi-Centenial--N4623
Next smallest is Maroon W/ 3-Orange--N4485
Next is Maroon W/ 3-Pink--N1904
Largest are Maroon W/ 3-Orange, 3-Green--N1905 and Brown W/ 3-Must, 3-Red--N4600

When I said that N1904 is the large head, we were comparing it to N4485.

I know that the smaller heads were before the fire & larger heads after
the fire in 1980. Beside that fact, who cares what size the head is,
when we can determine the proper code by the color of the inserts, chip
color, inlay shape, etc???