@Insider. When are you going to reveal the grade of the Dahlenega mint Half Eagle? I'm really interested to see if any of that is wear.
The coin is MS. The image does not show the original surface luster very well. The point of the post was to show that coins with flat strikes can usually be graded by other parts of their design. 1922 cents is a good example. I ALWAYS grade circulated Lincoln's starting with the amount of design left on the wheat stalks. If I recall, there was a very slight rub present also. A PERSONAL grade of AU-something, flat strike on up to MS is correct. These coins go for lots of money in high grade so there may be other factors (above my pay grade) that might influence an AU/MS decision.
The is all the more reason why you should post both sides of the whole coin when you are teaching grading techniques. You admitted that you go the wheat ears when you grade 1922 Plain cents. Here is a piece that Heritage sold which is graded MS-63. Grading this piece from a small part of the obverse would be difficult.
The 1922 Lincoln (especially the No D varieties) are known to be especially difficult to grade due to their terrible die condition. With this gold piece, the breast is very flatly struck but the wings have full detail which was the give away for me (that and the breast area was not worn glassy smooth). With a 1922 Lincoln...in my experience they aren't fully struck anywhere. So, the giveaway that I saw on this coin won't be present. Do even the No D cents tend to have fully struck wheat stalks? Obviously, 1922 cents are known for poor strikes so anyone with even a passing knowledge of the series will be aware of that. But, I still find grading them very challenging. Any advice?
If I ever need to post an entire coin to make a point, I will. As far as GTG from images such as the 1922 cent and your Quarter Eagles images go - it is all a fun game. I am rarely correct. Furthermore, I believe anyone can GTG from a part of a coin BECAUSE THAT IS THE ONLY PART OF THE COIN BEING GRADED. Get it? That's as simple an explanation as I can make it. MINT STATE! MS-64 or 65. IMO, the 1922 was down graded to 63 because of the spot removal, carbon spots, scratch and hits on the reverse. Its obverse is a weakly struck "gem."