I've downsized a few times over the years. Only regret was the first time (needed gas/girl money in college).
I agree with the above comments re: display...just need a bigger display!
Aside from the group shot in your hand, there are probably another 3 or 4 that stand out amongst the others. I agree with the other comments, a nice group of vintage marbles.
I'd lean towards Navarre as well, nice marble, beautiful color. From what I've seen, most of the green American handgathered slags are a brighter green. Can't recall if I've seen one this shade before.
Vernier/Caliper styles can sometimes be hard to decipher but pretty sure that's reading .753 of an inch.
I agree Champion New Old Fashioned, I had one kicking around here years ago.
Nothing I'd consider "extraordinary" but there are a half dozen interesting ones in the last pic (any non-white or yellow Latt is usually a bit more desirable and it looks like you may have 3 or 4 that fit that category)
They are a bit odd, not ground or faceted, kind of rough like a regular pontil but more elongated. Similar to that you see on some Indians. I'll see if I can dig up a pic
So if:
"... in 1873 he perfected his globe-stoppered bottle. "
that would be pretty early in the grand scheme of making marbles (or glass globes). Interesting links, thanks