5/8" Vitro Agate Co. "Bulls-Eye" Phantom Conqueror vintage marble-Mint 9.9  Looks like some oxblood might be seeping out from under the patch on the one side.

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I use the marble grading system of the Marble Collectors Society of America established and accepted by marble collectors, world-wide, as the universal system of grading a long, long time ago as follows:
Mint: A marble that is in original condition. The surface is unmarked and undamaged. There may be some minor rubbing on the surface, however, the marble is the way it came from the factory.(9.0-10.0)
Near Mint: A marble that has seen minor usage. There may be evidence of hit marks, usually tiny to small subsurface moons, pinprick chips, tiny to small flakes or tiny to small bruises. The damage does not detract from viewing the marble. If there is noticeable damage, then it is on only one side of the marble and the other side is Mint. (8.0-8.9)
Good: A marble that has seen usage. It will have numerous hit marks, subsurface moons, chips, flakes or bruises. The core can still be seen clearly, but the marble has obviously been used. If the damage is large or deep, then it is confined to one side and the other side is Mint to Near Mint. (7.0-7.9).
Collectible: A marble that has seen significant usage. Overall moons, chips, flakes, and bruises. The core is completely obscured in some spots. A Collectible marble has served its functional purpose and been well used. Still, it is a placeholder in a collection until a better example comes along. (0.0-6.9)
Note:  Any damage to the surface of a marble, no matter how slight, will affect its value. For a given amount of damage, the depreciation of value is much greater for machine-made marbles than for handmade marbles. Even a small chip will effectively reduce the value of a machine-made marble by more than half. Collectors tend to be more forgiving of damage to a handmade marble, perhaps because handmade marbles are more difficult to find. Some collectors use a 10x loupe to look for damage when grading marble. It is impossible to find any marble that does not have some mark on it under a 10x loupe. Every marble has rubbed against something. You will never find a handmade or machine made marble that can grade as a 10.