Estimating prices on a marble based upon photos (most of which are either not focused - or badly lit.... or both) is a rather foolish errand. The vast majority of marbles offered for sale on any internet fora are by either people how are clueless how to grade, lie/exaggerate condition or cannot accurately ID what they are selling. Why is it that 99% of those misidentified marble are incorrectly identified as something worth FAR more than the pedestrian common marble they are offering? How did we get to the point where practically everything is called "mint -" ????? Ditto for "mint" marble with obvious damage, often accompanied by weasel-words like "as-made" (were you there at the factory when it was made?), "tool touch mark" on a machine made (really?) and undisclosed glass fractures which the seller would later say "well - the outer glass was mint!".
At a show you can grade it yourself, examine it and it is what it is. Value is much easier to arrive in the context of correct grading and ID.
IMO