I think it depends.

Usually a 85-89 911 cabrio costs arround 24k to 30k (with around 100.000 km) euros here in Portugal.

I think the price will be higher if the rear turbo look is from factory or post factory (just like the front slantnose option where most of them are fake).

Dont know if this one came from factory like this or the turbo look was added latter.

Believe me, this thing live is just beautifull, photos dont do justice at all.

And it's funny that a car like this one with 22 years makes me waste about 30 minutos just looking at him and a big smile in my face.