Sometimes an error slips through during production. Collector's often like these for the rarity.

Metallic Strip

Sometimes a bit of metal gets mixed in the glass and ends up on a marble

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Bifurcated

Definition of bifurcated : divided into two branches or parts

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Bifurcated Dragonfly
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Pieces of oven brick sometimes find their way into a marble

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Cullet are leftover pieces of glass from a marble run. They can be fun to collect.

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Double stamped comic marble

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Sometimes things got horribly wrong!

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