Please help… “Space Duster”?

I have a Plymouth Duster with a slant 6 and it runs and drives. Brand new front disc brake calipers and a fresh oil change. i was told it might be a “Space Duster” because it has a fold down rear seat. It has the original engine and trans. I’m new to Mopar so I’m not familiar with all the models. I’ve never even heard of a Space Duster. Is this a special car or just a base line Duster? I’m thinking about selling it but don’t know what a fair price would be.

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