Alan

Color variation is a norm. It was a crude, ultra-cheap manufacturing process affected by a range of factors, including the weather.

Left is a dirty crockery. Right is a beater machine made.

Focus isn't bad, but its far less than the lens is capable of. The image data is stripped off so I can't look at that to advise better. The stitching pic, viewed at full res seems to be choosing a focus point that isn't at the cloth - almost like a manual focus was made and then the lens distance changed (guesswork). The rope pic is of much lower resolution and it suffers from the camera not knowing whether to set exposure (and focus) on the white or the back. There is more black - so it may have averaged for the black. over-exposing the white. Note there is little detail in the rope strands. Part of that problem is focus (most) and part is over-exposure.

You'll find this thread helpful for identifying Ravenswood: https://marbleconnection.com/topic/7584-ravenswood-novelty-marbles-a-review-of-varieties/

Ravenswood

No pontil. Its a machine made. Try to not see glass defects as a "pontil". Look at the whole marble.

Pelt

A '9' can be formed on the rollers as the glass cools. The whole point of the rollers (beside cooling) is to impart a spin/twist to the glass. The MFC '9' has certain characteristic to it.

Master

Red slag. Oxblood is a very different color. Oxblood is brick red and opaque. Recommendation: Oxblood is not the Holy Grail. Hoping for it will cause you to misidentify it. Just look at it and let it come to you. ***Attend a marble show***

Either you aren't within the focal length of the lens or it cannot figure out what to focus (and choose exposure) upon.

Quite. It is air trapped very precisely in uranium glass. Mark Matthews. Big - 1-3/4".

Crazy people. (Don't forget integers)

I noticed that in your newest pics, the remaining glass is convex. Given that, I'll stay with my initial suggestion.

Are you using manual focus and exposure select? Your manual should be helpful.

Not HTF to me. Huge number of dug Indian Blankets came out of the big digs. Its interesting that it is bid this high, especially how it is expertly photographed with all pics consistently out-of-focus so the condition cannot be even guessed at. However those with some experience (and sharp eyes) can look at the black and see all they need to know, especially if they have seen the many dug examples.

Looks like a flopover ingot. I assume its OOR? Just guessing that in hand, its much darker than in the pic (a lot of flash there).

Onion

If the edge is somewhat rounded (appears like it might be), it is an annealing flaw where the missing piece popped off. It doesn't appear to be flat-spotted.

I use the longstanding definitions of 'buffed' and 'polished' that have been in the hobby for some time. "Buffed" indicates that polishing has been done but remnants of the pontils remain. "Polished" indicates that the polishing effort removed the pontils, as in this case. It could have originally been any one of 5-6 types, evidenced by the sole remaining white bands. I have my fact-free guess, but there is no way of knowing.

Heavily polished handmade. Look at the glass flow.

I think its a fine marble with some great hallmark construction cues.

Here are some examples of what oxblood looks like. Note the density and color.

Noox.

Vintage (and to a large extent, modern) marble making was a relatively crude process. It was by no means a precision process. Glass color was affected by a number of factors, including the batch source and mix, what was in the cullet pile , how the furnace was running, how much the pot had cooked, and even the weather.