I'llhavethat1

Based on construction, size, and orange peel surface texture I'd consider European sparkler. With a couple less colors than normal.

Wow, nice marble. I had one similar as a kid with a bit more white and black streaks. Only other time I saw one similar was quite a few years ago in a collection with a bunch of other smaller Masters.

Equater of a marble is similar to an equater you'd see on a globe. Basically, a sphere at its widest distance around.

Is there any white? Or is the base glass yellow? Either way not sure if it's a slag from the pics

Sorting through my (somewhat) neglected machine mades and got these out for the light of day, first time in a while. Hope you enjoy

Looks like an unassuming catseye? Probably some type of subjective sentimental value, in which case you should label it so it's not lost in the mix.

^^agree that seeing in marbles in person and speaking to knowledgeable collectors is a quicker way to learn.... This is great if you live in (or able to travel to) an area where marble shows are hosted. But like anything, it takes time and effort to process info without 'overloading'. Curious about the window you mentioned? I repurposed a double pane window and was able to fit the marbles between the glass panes without gluing, mayble this is an option for you

For consideration (pic from ebay)

Looks kind of like a swirl to me. At that size and way the glass looks in the pics I'd wonder if it's a Champion new old fashion. With a twisted pattern.

Correct. I imagine some end up in gardens from old flower pots being dumped.

I thought I had a match for the OP in my Vitro pile, but after rooting around these are all I could come up with (search continues) Bottom right are obviously Pelt Carry on!

Bumpity

Looks pretty good and a nice way to reuse i

Vitro vibes for me based on the pics?

Approx 7/8" unusual core. One of my favorites.

close up of the Vitros around 7/8"+.

Another tray I got out to see the light of day. Spring cleaning time!

Using a sphere machine though, right?

That's a lot of glass! Perfect day for getting some fresh air

Highly doubt torch made and some interesting traits that need a closer look. If it's vintage its a nice one.

Impressive group, wow.

Looks like one of those foreign marbles referred to as pincers (or pinchers, don't recall). Anyhow, machine made probably 50-70 years ago judging by the lots I've found them in previously

What color is it in hand? If red? Pretty much rules out MFC. Either way I'd lean more towards CAC based on the pics

If we're all looking at the same marble in the OP, it appears to be a Foreign handgathered/ transitional.

Hangathered for sure, but unless the pontil is ground/faceted and the marble is a lot more "round" than it looks in the pics I'd say No to Greiner for the OP