This top portion of this top is a Porter & Reed hardtop. It appears the sides and back were removed and replaced by canvas (or remnants from a soft top).

https://www.facebook.com/marketplace/item/701735811559702

“1946 Jeep CJ2A · Other_body_style · Driven 1,000 miles 46/47 CJ. Minor modifications over its history. 12 volt. Was running up till a few years ago. Previous owner had medical issues. It does turn over. My son(owner ) is working on starting it up. Price is NOT firm. If your interested I can give you his number”