I'llhavethat1

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

Based on how out of round it appears in the pics....I'd guess it was originally intended for something other than a marble. Jewelry or lamp finial or something

Sun was shining and this one called out for some fresh air. Plus I don't recall if I posted it before? 21/32"

Old German Handmade.

German cane cut slags is what I call them. Still looking for blue and red examples!

They are closer to 11/16. Three on the right came in trade, one on left I already had

Some nice finds recently there Ric. Here's one I traded for ~7yrs ago and was happy to find again

Break in the squallls today, nice to get some sun. Lobed solid core 1 - 3/16"

I'd say newer contemporary.

Yes, I agree with earlier opinions on subject marble. Pretty beat, but good place holder for collectors on a budget, if they are in the market for this type

No expert here, but I agree the more labor intensive the pattern the more desirable. So if the spacing/geometry is good, or more colors (I see three colored stripes on both left marbles), those are good traits. Your marbles are good examples of the type When you get into the figural design paintings, thats a different beast. Big $$ and questions of authenticity.

Some handmade Germans do have oxblood, then there are some that have red that look like oxblood. Much like machine mades. Nice group of PeeWees

Could be a Peltier peerless patch. With contamination causing the metallic stripe. I've seen similar in this combo.

Nice German handmades. I agree with the symmetry. I'm wondering if the first isn't actually transparent blue over yellow. Making it look green from most angles.