If all is in good shape, it's a heckuva deal. The 28mm usually goes for $400-$500 alone, because its much rarer to find than a 40 or 90mm. They all have those white spots visible from the front, around the outer edge of the lens, but they don't effect the photos. Just be sure they're only around the outer edge, and look VERY carefully for any signs of fungus. I bought one of those lenses, and after 1 year (correctly stored, no dampness) it was suddenly full of fungus. I've never had a fungus problem with any lens in the 22 years I'm in my home, and I must own about 40 lenses. I had it successfully cleaned just this month by Essex Camera Service, but it was a very stubborm variety and it took them 3 weeks to do it. (they've dome some lens repairs and service for me in the past in only 3 days.)
"Artificial Intelligence is no match for natural stupidity."