Alan

No, they are just poorly made marbles. That happens in mass production. They were usually discarded as refuse.

Marbles were commonly used as claw-foot balls back in the day.

(Noting the seller to avoid their auctions)

The "concept" is emptying the glass tank of most of it's contents for a different batch of glass. In practical reality, it was used somewhat as a euphemism for something else related to accounting.

Not a Popeye.

I do - but generally just before tight turns.

Master.

It is a Rolf and Genie Wald piece. "Baddog" is their signature for marbles that didn't quite turn out the way they wanted.

It is someone's "fooling around at the torch" contemporary egg. Notice at the rod attachment point that it was overheated. It was intended to be an egg.

I think 15 different people could have 20 different ideas of what you are describing. Best to post an actual photo of what is being described.

Pessman.

All Lightning Strikes that I have seen and know of are on opaque white. Take care assuming ID.

A small fraction of mine:

The bag is not right and appears to be new.

1st: Akro

New MK.

Hopefully Covid will ease and we can get back to shows. Ebay and Facebook are poor sisters compared to in-person shows.

I have never downsized - or frankly, even sold anything in the past 20+ years. But I think its helpful to step back ask ourselves what we are doing this for. What is the focus of the collection? If there isn't a focus - then its more of an "accumulation" than a collection. Our focus may shift over time - and some re-thinking may be in order. FWIW: A well known person who has been in the hobby for 35+ years once said: If you don't have it on display - its time to let it go.

That assumes that factories sourced their sand from single sources which were in themselves consistent. I wouldn't assume that. In glassmaking, bubbles are usually a phase in cullet/substrate melting. Glass which is not fully up to temperature can often contain bubbles. I saw that in a glass pot on Wednesday.

Glass flow looks Master.