UPDATE: **SOLD** Was $500.
The seller believes this is a Beck cab, but the rear top piece is angled. I couldn’t find a top that had a similar rear piece. http://cj3b.info/Hardtop.html “Steel full cab off a CJ3B. I believe it is a Beck cab. Rear door sandblasted and painted.”
Could be a top that was made when the Kelly/ Beck transition was going on? I read that some parts were mixed, this could be one of them? Definitely has the Kelly angle on the back of the roof.
Definitely a possibility.