The '70s were a crazy time, they made cheesy boogie van windows that would hinge open. It could be a factory roof, I don't know enough about those cars to really have an opinion, but the fact that it's bubbled plexiglass and not tempered, flat glass makes me think that it's not a Honda piece. That and the fact that usually even an aftermarket sunroof will have a frame inside the car that the roof will hinge onto, not the frame on top of the roof, and then the hinged window on top of that. To me that thing screams "Hey Cletus, hold my beer, Ima make me a sunroof!"
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"Don't look for one place to lose 100 pounds, look for 1600 places to lose an ounce." - Tony DeFeo
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