1922 Lincoln Cent - Weak Or No D?

The other day, I was going through a bank roll and I stumbled across this 1922 penny with no obvious D. Here's some pictures of it:




My brother is a pretty experienced coin collector and he told me that he thought it was a weak D. Here's why. In this next picture, look at the very center of the circle. You will see a raised portion:



Yes, I stuck my camera into my microscope lens (the microscope is 5x zoom). Here's another picture except without the circle to show you where the possible D is:



In this picture (which was taken from the side), you can see a little raised part right below the date. That's where I think the mint mark is.



My brother and I both graded it to be a G-4 (believe me, it looks better in the pictures than in real life) and we also both agree that it was stamped with Die 3 because the reverse is slightly rotated. Can any of you give me an estimate on the worth? Thank you.

PS. The only reason I'm using external links for the pictures is because my pictures are > 100 KB and when I tried to upload them here, it said I couldn't because they were too big (it also said the extension JPG wasn't allowed?). If any of you staff suggests a better idea for posting the pictures, please let me know. Thanks.