1985 Raleigh USA Grand Prix. "555SL" main tubes - essentially Reynolds 501. Great looking bikes, and can't beat the price. Looks like the semi-blah original crankset has been swapped too.

I'd probably pay $150 for it as is, for I have the blue Super Course and white Competition (also 60cm versions, as that one you're looking at appears to be) that make up the R/W/B '84 series ('84 GP's are identical to '85's, except for the "USA" decals in red/white/blue as opposed to yellow.

-Kurt