As far as it being "obsolete"...you might want to check up top..you know.. where it says "Classic and Vintage". That being said, I do believe in being helpful when I can as I have received so much help from these forums.
I am not from the SF area so it is hard for me to guess what the value of this bike would be relative to the area. Here in the midwest its an ok deal. If the tires matched and the front chainrings were not completely worn I would certainly scoop it up. The $500 is one thing but the bike will certainly need an overhaul and new front chainrings....I would probably buy it at $500... would be happier at $400.
Please rotate the handel bars down before posting anymore pics...wow does that look bad