I'llhavethat1

There are probably a few answers to those questions and some of the terminology varies. For me "jellcore" would be a solid core except the core is translucent like jelly. "ribbon core" is one (maximum two) flat ribbons of color, thinner they are the more "razor" they become. Once you get more than two ribbons, those become a "divided core". Some "solid cores" are lobed, and when the lobes separate (you can see clear glass in between) they are referred to as divided core even though the person making them may not have intend them that way...keeping in mind they were cranking them out pretty quick. There are a couple good marble books that may be a good reference for you. Thats my 2 pence

Agreed with the above, and refreshing to see

It's been packed away for a while so I got it out for a closer look. You're correct, there is a pulp/paper/cardboard backing and the upper face is metal. here is a pic of the bottom

Not tin, actually some type of cardboard (or paper mache) best I can tell.

Welcome to the site. Any specific types you'd like to see (handmade, machinemade, certain types/colors, companies, etc.) can be a click away in the search feature. Or if you're not sure, ask away, and we can assist (as Chad mentioned).

In the original post, top left looks Vitro and the others look Foreign ie: pinchers (or something along those lines)

Took some oddities out for a group shot, (some might not even be Pelts, at least 3 are questionable to me).

Based on that Pic, I agree with Ric

Last one looks newer to me.

I wouldn't normally expect it either but this is what made me ask. could be a rough spot, reflection, or focus issue, who knows.

Is there a pontil on the slag? Pattern does look like it could be handgathered.

Agree on the OP being Alley. At least that's where I kept my shooter sized one (Don't see them around much, at least for me). BerryB's marble is a CAC

Looks like an unusual Petlier to me. Nice!

The clear based look extra cool

I'm kind of wondering if the marble in the original post is is some type of torch work marble. 2nd pic down has me especially thinking that way.

Very interesting. I don't doubt the experts, but would love to see how the pontil (on the other pole) looks on these examples.

I've heard those eggs are more modern and made in China but haven't seen one myself so

Very nice! Looks like a great combination of thought, time, and talent went into it. However you choose to display (wall hanger, table-top etc), make sure the glass and frame are good and sturdy. I've reinforced my wall marble display a few times (call me paranoid) since the weight can unexpectedly add up. The sound of a CRASH, followed by a bunch of marbles tumbling everywhere wasn't something I want to hear.

Look like Akro Patches to me, but the oxblood is a bit more on the purpley side (on my monitor anyway). Since the pair compliment eachother I don't mind seeing them both in one thread

That feature would prevent it from being an intentional corkscrew for most people. I'm not aware of any other manufacturers that had the technology like Akro did to make corkscrews (spinner cups, etc.) Sometimes a twisting pattern will result from a marble traveling down the rollers. I believe some of the more common examples of this came from Jabo and were referred to as "jorkscrews", since they looked kinda like corkscrews but were more of a fluke. Yours isn't a bad looking marble, the, UV, oxblood, etc are pluses. Did I miss the size?

You didn't mention a size but Akro is a good possibility

Sounds about right to me. The base glass on these are very "soft" so chip and fracture easily. Kind of a translucent white. Stripe colors include (but not limited to) blue, red, green stripes (sometimes all three at once). Then there are the black based ones, and the blue based ones etc.

I believe they're referred to as "cold roll" marks from the rollers not being at the correct temperature to smooth them out. A lot of industrial marbles had this feature (how the marble looked wasn't as important) .

Green Clambroths aren't something I've seen much of.