Originally Posted by VeloceMitch
that's puzzelling
Maybe it's been replaced at some point in it's past. Both mine and Ricks have two vents, though mines been modified extensively (badly!).
No it never has been replaced..though it is a series 1 1750. I have it on good authority that during the 1750 production run, Alfa changed the design from 2 to 4 vents and just started assembling the cars with them when they (the 4 vents valance) became available.