Alan

What people call "lashes" are caused by dull shears. Any manufacturer.

You camera is unable to focus that close. Back up the camera until the marble comes into focus. Look up how to do a manual center focus select. Also, pics taken on a black background will always come out dark, as the exposure averages on the background unless you choose what part of the image to focus on.

Try not to look at mass-production marble making as a precision process. It wasn't. You can't produce perfection at 1/20th of one cent each with crude tools in a dimly lit shop.

I will say not Ravenswood.

I don't see anything aggressive in this post. It seems a reasonable question in a world where many people are declaring this and that as rare or the unfortunate use of the term "same run" to describe machine mades. Maybe someone has an estimate of production (?). In the case of a company with production as staggeringly huge as Vacor serving a worldwide market, the concept of a limited production of a marble design is worthy of discussion.

What color/tint is the base?

I have looked at the signature pics in different ways/different assumptions and have nothing in my mind or list. The style doesn't point to any particular style and could have been made by most any tank artist.

Akro

Looks MK. Odd because it looks like the single ingot folded over.

You can get safety glasses for it (buy credible ones - they're your eyes). I have Uvex. We don't get 'do-overs' for our eyes.

Its a type of higher power UV light. Lately, more people are buying cheap, high power UV lights while ignoring the eye safety issues that come with their use. Looking at 395 and 365 without safety glasses over time leads to cataracts or macular degeneration. Most people seem to ignore this FWIW.

Note: They are Noble Efforts - both Richard Marquis and Ro.

My runner-up:

No, but new glass.

Pelt - with two divots from someone driving a golf ball off of it.

Not Akro IMO.

I admired his work and the skill that made it real. An innovative, creative approach with precision to back it. He will be missed and we are poorer for losing his talent.

"Mangle mint". You get six Internet points for that. Let history reflect that you invented it!

Well, if you look at it, its not a simple DI. There was a whole lot going wrong there. Its interesting that you post this because earlier this week I was on a call whose subject was (mostly): "What happens if the shears cut off more glass than the rollers are sized to handle?" The well-informed result was something like what you have pictured. Its going to tumble over on itself and get wonky in the rollers and be unable to round itself in any real way. I suspect you have that, or the shear cut 2 ingots not of the same size (essentially skipped half a beat), or the single ingot picked up a small piece of hot scrap and they basically "fell down the stairs" through the rollers.

Diameter?

Vacor for me.

MK

It has every appearance of being an agate. Surface and subsurface damage.

There is no such thing as Akro "same run". "Same run" has become a whimsical corruption of "same cane" from handmades. Seemingly to denote rarity and collectability. Akro ran standard dedicated production to a well-known palette of color combinations and types (corkscrews, patches etc). They filled orders taken by salesmen ordered on standardized product sheets by retailers. Changing glass in an otherwise well-running pot was unnecessary until the pot lining degraded and began mixing with the glass. So one machine could and did put out a popular type and color combination for many months - again, until the pot degraded. The entire idea of vintage marble production was to find a successful design and then produce it as cheaply as possible (very small fractions (~1/20th) of one cent each) as fast as possible 24 hours a day. Then, in Akro's case, ship 2-3 train boxcar loads twice each week. Get that machine producing an exact design and color combo and make many hundreds of thousands of them - cheap. Then rebuild the pot, lather, repeat. Sameness and consistency was the goal for each machine and operator. The Akro Agate production floor was quite large and sustained quite a few machines, not just a few. We know this because of statements made by Akro employees and proven by the layout of water drains on the production floor slab that went from the machines via a french drain system to the waste outflow. (Marbles were found in some of the french drains, including some weird oxbloods). I think that the "same run" idea was born of Facebook denizens who have not studied vintage machine made production and have dragged a factual handmade name to a romanticized mass-production idea that isn't supported by fact. Vintage machine made manufacturing was very rarely experimental. At 1/20th to 1/30th of a cent each, a manufacturer cannot afford much experimentation. The same is true of filling retailer orders. If you ship me marbles that look much different than what the salesman showed me in the (very consistent) Sample Case, then I'll tell you to take them back.

Appears to be a game marble.