From the listing:
Complete car (except engine) in need of restoration. Ran the 1980 F1 season, and participated in the famously defunct Spanish Grand Prix of that year. Held by the Shadow Team continuously. Please enquire for pricing and further info.
Currently listed at http://vprace.com/carsales/shadow_dn11/shadow_dn11.htm
Price not listed.
The Spanish Grand prix in the 1980 was meant to be apart of the 1980 Formula 1 Championship but following the running of the race the competitors were told that the points would not be awarded. This was down to the FISA-FOCA war and Ferrari, Alfa Romeo and Renault did not take part in the race so the race was declared illegal by FISA.
1980 was also Shadows last year in Formula 1.