I believe we have a winner. The inside bottom loop of the 3 is straight. On regular '43 it is curved. http://www.usacoinbook.com/coins/997/nickels/jefferson/1943-P/3-over-2/
Ok, took some more pics. Appears the point from the hook carries over to the hoop in the 3? Really wish I had a conformed coin to compare side by side I'm starting to think it is the die break version but wish I had pics of one to compare. This angle exaggerates the bottom loop since I have the bottom of the coin tilted up. I still can't decide if I see a feature inside the look that would be the flat part of the bottom foot of the "2"
I also think it is the die break. Even if the 'feature' you mention is there, it would appear to me to be at the wrong angle to be the foot of the 2.
That's not the 43/2 over date this is There's a 1943P that has a faint die gouge that extends upwards from the lower ball of the 3 . That is often mistaken for the 43/2 over date and that is the OP coin.
Another pup is the doubling on the other digits as well as the bow. Compare the 4 of the op's coin to the one I have posted. There no split as well look at the 1.
Ok well I was all set to give up on this, but it's been in the back of mind. As a result, I spent hours searching online. After looking at photos of well worn nickels, not all show signs of doubling around the other numbers. In fact on the circulated examples I couldn't see it at all. Biggest trait was the hook and foot of the 2, giving the inside of the loop of the 3 a pizza pie slice sort of look. So I see the angle and pizza slice looking geometry here. Compare to a standard 1943 Fairly rounded inner loop of the 3. Now...my coin. I'm trying to not get my hopes up, but I see the pizza pie shape here and that particular angle as shown above. There is a little wear on the top of the foot, so there is some shadow play in the photo, but under a stereoscope I can see it...along with point of foot to the left and below. I'd photoshop the angle I am seeing but I am on a phone right now. I know that even if it is the 1943/2, it's not worth that much...but I just want to know or it will bug me forever.
Or you could just read the Cherry pickers guide and it's explained there very plain and simple . And save the grading cost.
Ok, so got my hands on another overdate. This is a completely different coin. However, much easier to see that this one is the overdate. With both coins in hand, I've compared back to the original coin and have came to a conclusion.