Alan

Vintage marbles were made for ~ 1/15th of a cent each in a crude manufacturing process. Don't look for precision. You'll just be disappointed.

It appears more like a shear defect on a game marble.

Where is the "pontil"?

Someone's early torch experiment. I don't see a pontil and there shouldn't be one.

Good decision.

x2

7/8" Tiger (left); 1" Bengal Tiger (right):

I'll point out that the hot glass is still viscous when it hits the rollers, As it spins down the rollers, glass can form a "9" or other wrapping patterns before it cools.

Who established that - and specifically how?

Agree. I think the first piece has an even chance of being Akro, but there is no clear pointer either way.

What is called "aventurine" (aventurine is actually a mineral) is formed one of two ways. The far most common way is by accident by adding too much colorant to the batch (its added by the shovelful) in the form of various metal oxides which crystalize as the glass cools. The far less common way in intentionally - as Peltier did with a number of their better marbles. This latter approach was a bit more costly and created a very dense crystalline patch. Over-saturating the batch a bit with colorant wasn't uncommon, especially it seems with green glass. As I've said before - there wasn't a big wooden barrel at the marble factory with the words "AVENTURINE - USE SPARINGLY !" printed on it with some magic powder inside. Marble making wasn't rocket science and vintage marbles needed to be made for tiny fractions of one cent.

Foreign Cat with undissolved colorant.

Not for me.

1. Divided core 2. Latticinio core FYI - your camera is focusing on the background cloth, not the marble. Its better to manually choose center focus. Then your subject won't be so blurry.

Akro

Purple slag. "Purple brick" is someone's invented term of uncertain motivation.

1. Its a modern torch piece 2. That isn't oxblood

I saw a large, inflatable turkey holiday decoration in someone's front yard the other day.

For an extra $10 - you can probably get it signed by Abraham Lincoln.

It wants to be a Popeye, but falls somewhat short for me.

Modern repro. Poshmark, Ebay et al are lousy with them.

Its neither Akro or an "experimental". Caveat emptor.

I mistook Jeff for the OP and mistakenly responded. My error and I have edited my post. Apologies.

The iridescent finish on that glass isn't from water "mineral staining". Its from original production.

Vacor for me.