Here is a marble I found today and it looks different than the others that I have found in the past. It’s in good shape but the blue looks like it’s on the surface of the marble and also part of the marble (not a paint)? Does this one have any value? How old might this one be?
That's a Peltier Rainbo. I don't think there are exact dates pertaining to the production of their later rainbos but I think mid 40s or so and on for the next 20 years or so.