Speciale were standard sprint veloces that were converted to 'Speciale' spec here in the UK by Alfa UK who were then based in Dover.
The conversion consisted of replacing chrome bumpers with Series 3 sud plastic items, a rear spoiler, some had colour coded grill bars, dark grey alloys, trofeo style stripe etc... I have only seen them in silver or that cream colour that seemed very popular!
I believe this was done to clear the sprint stock in preparation for the Green Clover Leaf model that came in towards the end of 83
Looking for sprints in E&M in 1985 I used to see loads of these for about £3000 then - if only I could go back!