Thanks Carnut!
It's called the Ferrari '410 GTC Speciale' and was built in steel (except for the bonnet) by Australian David Levy in the 1980s as his Italian dream car. It used styling cues from several Ferrari models, but perhaps most of all (especially at the rear) from the Intermeccanica Italia. Levy passed away in 2012 and the car was offered in an auction recently. To my amazement it didn't sell, while the estimate seemed not so bad. It shows once more that people go for the known stuff…? What a fabulous car.