I'm beginning to work through my current Morgan holdings with the QX-5, to see what I may have which I didn't know I had yesterday. It's as fun as metal detecting, without the dirt. :)
I'm playing with light levels, external lighting and filters, as the direct light is mounted on an angle and too bright for some details. Here's a little of what I found:
An 1878-S
VAM 15:

Bulged P? Check.

Slightly-doubled LIBERTY? Check.

Doubled 7 not mentioned in the
VAM description? Check.
A couple interesting things from my avatar coin, an 1879-S:

Polishing lines. I've found amazing numbers of polishing lines in my coins.

It's an S/S of some sort, but doesn't quite match any available pics.
A couple others:

Mintmark on an 1880-O. Ever seen one like this?

An interesting structure in an 1888-O.

A closer view - the line is definitely raised.

An 1889-P, just like the
VAM 36 spike, but it's in the wrong 8. :)

1898-P
VAM 2 right shoulder die gouges. Except, contrary to the pic at Ashmore, the left shoulder looks like this:

This almost looks like a clash.
I'd say I'm having too much darn fun with this microscope, but that ain't possible. :)