I own two of these bikes, and follow the gran sport model on ebay (as its one of the 2 raleighs i lusted after when I was a kid.) I'd say this is the very best instance that I've ever seen.
The Raleigh/Suntour gear system and blue weinmann 610 calipers are consistent with the 77 model year, that information shows up in the parts lists on sheldon brown's retro raleighs web site.
The bluemels fenders are a perfect complement for this bike. The pump is original, and I have seen pumps (Brittania?) like this in bad condition go for $50 on ebay, whereas this one is in great condition. I have never seen one of these pumps sold as NOS.
With the included accessories it's imho easily worth more than $400. People here in San Diego see me riding my blue gransport all the time, it's one of my favorite rides.
- Don Gillies
San Diego, CA