This cel is together with its original background. It is for sale:

It is from the second episode, "The Wind in the Desert".

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This is a 3-cel setup with background. It is for sale:

It is from the original series.

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This cel is from the 22nd episode, "Dangerous Journey".

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This cel is from the 40th episode, "The Troublemaker".

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This cel is from the 10th episode, "Two Hearts and Two Minds".

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Here is a model sheet for Kimba's mother: