I was referring to a clear based Guinea you show pictures of and the of splotches of color on the surface. the less white spots the better. Clear based Guinea's are the lowest priced.
Not Christensen, I see no tail, just drizzle, machine made IMO, I won't hazard a guess as to the actual manufacturer of the marble at this time. Someone will chime in that knows what it is, maybe @cheese will have an idea ??
These all look like clay marbles as far as I can see, probably a mixture of glazed and unglazed. Some called Bennington's and I do seed some called Chinas. You can sort these by glazed and unglazed, that'll be 99% of the battle.
Contemporary Vortex marble, look for any possible initials on the end for a further I.D. some have none but there are people here that can still I.D. the artist
After you post a while you'll be I.D.ing your own and can double check here I know it looks daunting but it will go quicker than you think. When you post them post any visible seams and the sides as well, 4 views of each marble more or less.