That top is from 1981 the first year of production because there are no zippers on the back to go around the seat belt mounts on the roll bar. They stated putting shoulder belts in CJ's in 1982. IMy first Jeep was an 81' Cj-7 and they still were using lap belts.
I sold Polarfire his slate blue top with soft doors and it had the zippers. I bought it off of a guy who had an 82'.
I have a Levi's Denim Blue 1/2 top complete, they only made that color in 1981. I have a 1983so I had to perform a very delicate operation and cut small holes to accomodate the seatbelt mount on the roll bar.
I also had a white vinyl 1/2 top just like that I sold to Joe West in AZ, was in similar condition. Not sure what price I sold it to him, but you may want to PM him and he can give you an idea. That top looks sweeeeeet. Not a rare color, but rare shape.