I don't know if this Bugatti was actually for sale in real in this garage or just for the movie scene? If it was , imagine that you probably could buy such a car for few thousand "equivalent euros" at this time
though it's not my favourite Bugatti, it's a nice car
There is a picture of a faux cabriolet T55 in "Bugatti, sorcier de la mécanique". This one is even nicer , it seems to be lower... I think you are right with Type 55
the pb is the body, all pictures of T55 I have are for "roadster" body, this one is rather a "cabrio" body or "coupé décapotable" sort of, with fixed windows (windscreen, lateral door windows)