Need More Eyes On This 1946-S

I don't see anything out of the normal on these images. They are blurry and I can't see what your looking at. Are you using a microscope to take images through? If so you might focus on the field under the tops of the devices. Focusing on the field makes all come into view a lot better. If you are using a stereo scope (Two eyepieces) close one eye and focus the one your shooting the camera through. If you shooting through a loupe that a different scenario.

After using my Opthalmosope of all things to llok straight down on top of it with bright light; it actually does look like that picture j.h.s. What is it? Some sort of fill?

Well, first thing is this--of all the mentioned die varieties here in this thread, the most obvious thing is being overlooked. The 1946S/D OMM is a large, serif mintmark style. The RPM linked from the CONECA site is a ball serif style. The original coin in question in this thread is a sans-serif style. Three different kind of mintmark punches used and the #1 marker for any die variety of this date and mint...it's as important as large or small dates would be to identifying 1960 die varieties.

As for the coin in question here, I see nothing at all outside the norm in the photos. There are often slightly raised areas within a mintmark, especially S mintmarks, that might look to some like doubling, but in actuality they are just a part of shaping the 3-D letter, and are a part of the punch.