
The
Kennedy halves are a specialty area of mine. You chose a good series to look through. I hope I can help with my compiled sheet of what I look for. This is from many sources online and offline over a number of years.

Here are pics of the straight G vs. flared mentioned above:

Here is a pic of what is not a No FG variety despite it being slabbed. With real No FG varieties, there was not engraving of the FG on the dies - jence no trace of an FG. Ghosted lettering can be found from overpolishing of the dies.:

Slabs such as the above are not difficult to find. So beware if you would ever go to buy one.
Here is a pic of a very ghosted No FG. Study it and you can see the G:

The best way to see these ghosted ones in hand is to tilt it at various angles to the light. Although the above is actually taken from the PCGS website defining it as a No FG (which means they would slab it that way!), it is from an FG containing die!
How much squash could a Sasquatch squash if a Sasquatch would squash squash?
Download and read: Grading the graders
Costly
TPG ineptitude and No FG
Kennedy halveshttps://ln5.sync.com/dl/7ca91bdd0/w...i3b-rbj9fir2