I know people think that there are a lot in California but it's the same bikes that I see for sale every few years. And when I think there is a new one that I haven't seen someone else says, "oh that was so and so's bike". I'm not saying it's that way 100% of the time but you get my drift.
Of course I'm only talking about the 28's, I don't really pay attention to those antique 21's.