Hi AV
No, the two Spiders built by Bertone also still exist, when Alfa decided to launch a Spider, both Bertone & Farina tendered prototypes, these still exist.
The two Bertone Spiders were at the 50th Aniversary celebrations, one is the gold / white one, the other is the red one.
The picture I posted is of a 750 Sprint, which has had the roof removed - this was done by Nuccio Bertone to make a drop-head coupe out of a '55 750B. This car was a one-off, never sanctioned by Alfa & remained as a one-off by Bertone. After completing the project, Bertone chose to make the 2 Spider prototypes rather than persuing the DHC route. Ultimately Farina got the Spider contract.
Matt - ummm.... no, maybe we need to look at "lifting the roof" on your SS
Ciao
Greig