Picture becomes clearer.
Oops, I looked more closely at the "step down" at the rear edge of the door opening, and realize that I am TOTALLY WRONG in suggesting this a Duetto top. Not so at all. It fits the earlier models. In Seattle we used to have a business called Thomsons Hard Tops for us exposed to the endless winter rain, but not only for Alfas, but for all the small sport cars in the late 50's and early 60's. And I once purchased two plastic hard tops from Parish Plastics for my two liter -- selling one to some other half drowned native here, and then when I finally got a factory top sending mine on the way too. But the choice hard tops are still the ones made by the factories which made the original cars. I recall a factory hard top on the Giulia veloce that Jack Brooks had. It got too small for his family, and I suspect he still misses it. For many of us the song is "I wonder who's kissing her now?"