I've seen cosmetics, medicines and alcohol for sale in duty-free stores, but I have never seen anything quite like this. Gebr. Heinemann may not sell the Porsche, but at the very least they are attracting customers to other duty-free shops.
Implications - What I think is particularly interesting about Gebr Heinmann putting the 1959 Porsche in their duty-free shop is that it is a really effective marketing strategy. Whether you are a car enthusiast or not, you will be attracted to this 1959 Porsche.