I think the reason for the 2600 coupe prototypes (Pininfarina, Bertone, Zagato) is clear: Alfa wanted a smaller high-performance coupe beside the Bertone 2600 Sprint.I couldn't find anything in Quattroruote and Auto Italiana either, but I do know that the 2600 Touring Spider was introduced in March of 1962. The Spider prototype by Pinin Farina was shown at the Salone di Torino in 1962. I believe the same is true for the 2600 Boneschi convertible (but would have to look it up to be sure). These two cars were shown but not built. I believe it is unknown whether or not the decision to not build these convertibles was based on dealer responses or a corporate decision to go with a specific design. But I would expect that if these cars were shown, the 2600 Ghia must have been shown somewhere too -- and the drawing looks very much like it could be based on a press picture.
The Spider prototypes leave some room for discussion:
The Boneschi (BTW presented at Turin in 1963 on chassis 106.01*192742) seems to me clearly a styling excercise with no hope for series production.
It might be different for the Pininfarina and Ghia - Alfa Romeo might have wanted a new body for the 5-year old Touring design and contracted these coachbuilders for a new design. Ghias model with its low chassis number would support this theory, but Pininfarinas design appeared a bit too late for this version (Turin in November 62 - chassis number would be interesting). Even the facelifted Touring in the picture (from an old AlphaPlus magazine) could be a prototype from this period (although it could be a later prototype or not made by Touring at all).
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