This may be a Koenig hardtop. A few had the flat back like this. It also looks very similar to a Lambert top, but those tops had smaller rear windows. Oddly, it seems like the passenger side of the top near the passenger door area has been trimmed. I would ask for passenger side pics of this one before going to see it.

https://www.facebook.com/marketplace/item/2397674526934432/

“Here is a good condition factory Jeep CJ 3A hardtop. It bolts on. This is just for the hardtop only…not the Jeep. No rust or bad areas……needs painting”