Verkaufe mein M5. Aber preis? (Allgemein)

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Hello.
I am posting my 10/86 M5 for sale. Any suggestions on a realistic price?
I have information from Mobile Tradition that this car was in a commercial from new, so if any have a film with this blue individual M5, I am very interrested!

http://pics.autodb.no/1239/1239954-bilde1-picture409.jpg
http://pics.autodb.no/1239/1239954-bilde2-picture405.jpg