I think I've found fewer than ten examples of the Type C Reverse (maybe it's ten, but definitely not more than that) compared to the hundreds of Type B Reverses I've found. I've found way more 1956 Type B's (the tough date for the variety) than 1964 D Type C's.
Just checked and my total for this variety is only 8 pieces. Highest grade is an NGC MS62 (only one graded) and I've got one slider, the rest fall in the VF-AU range.
That mark near the chin is actually on the slab. That reason it has a dark line next it is the shadow from the slab scratch is casting.
?? I didn't make any comments about the mark on the chin. I'm referring to my post of yesterday where I said, "I'd say AU 53 obverse and AU 50 reverse. I'll go 53 for final grade". Normally the obverse is the driver of the grade of a coin, but given that the variety is the main value of the coin in this case, I'm guessing that the graders decided AU50 on that.
I got it. I was thinking about the first part of your statement with the scratch. I was thinking you meant that due to the important reverse it got a straight grade (AU50) verses a AU details due to the scratch. What you meant was they weighted the grade more on the reverse due to the importance of the reverse. I just misunderstood because of this: