Ric

If it's opalescent, it's a Vitro Opal. If you backlight it (not too brightly) you might detect an orange-ish opalescent glow from the base glass.

Another fun project is to pour concrete stepping stones and press marbles (hands, etc.) into the surface to make designs. I did this with my great nephews and nieces long ago and it was a lot of fun. They wrote their names in them too. We gave the steppers to my Mom, who absolutely loved them and enjoyed them in her garden for many years. I regret not taking photos because they were really very cool.

Morphy's sold this one about 10 years ago . . . Single pontil, I've had one in hand since I began collecting - they're rare as hen's teeth.

I am not familiar with any marble artist named "Drew Coin" or any glass house called "Bootlegger Glass". I think the marbles sold by Drew's Coins on Ebay may be handmade in China, although I am not certain. Does anyone else know for certain the source of the "Bootlegger Glass" marbles?

I'd like to have a Chinese Birdcage.

Normal tolerances for marble production are not that tight. The 1.5 mm difference between the largest and smallest you describe amounts to about 6/100". Vintage American marbles had tolerances of about 1/16", e.g., a No. 0 marble (nominally 5/8") was anywhere from a hair over 9/16" to 5/8", while a No. 1 marble would be anywhere from a hair over 5/8" to 11/16", etc. And FWIW, I think the peewees you're showing may be JABOs.

RE the OP: The red and black on white and the blue and red on white are vintage MK Rainbo Reds. The others appear to be vintage patch and ribbon style (including the Bumble Bee). I'm not sure I see any newer style MKs in the group. Although, the two green on white and the upper right marble are tough to ID definitively from the single view.

These appear to be Peltier Rainbos.

I agree with Chad.

Me too.

I'm leaning Akro. I'll bet it was beautiful new and that it looks a lot better now than it did before it was heavily polished - nice size.

Three good Peltier Rainbos and what Ron Shepherd used to call a "ho-hum" marble - the fourth one is nominally collectible, regardless of who made it.

Yes, a Marble King - the poles are the same color so it is a later patch & ribbon style.

I think it's an early Alley from the Sistersville location - great marble, and while it does have similar colors, I wouldn't call it a "Coral".

A Peltier Rainbo, for sure - the earlier six-ribbon type is far less common than the four-ribbon variety.

I agree with an Asian Caged Cat's Eye.

Yes, An Alley, from the St. Mary's location - fairly common, I think.

This is certainly a JABO. I don't recall the name of the run but there were some really great peewee flames in it.

It's a pretty one. It gives me some Marble King vibes but it might be Vitro - I haven't seen them all.

@Tommy I think it's a Classic, Tommy - not sure how old but not from an investor run.

I'm not convinced the first is a Vitro either . . .

The second one looks more MK than the first to me. That chiffon color on the first reminds me of Master but . . . ?

Looks Akro to me too.

I'm thinking JABO too.

I don't think I'm seeing a Whispler but I am not sure what it is . . . I do wonder about Kokomo as a possibility though.