Ah, thanks, hopperja. That's very helpful. From my years in the used and rare book business, I know that people frequently overestimate the value of items just because they are old.
However, she sure looks pretty in the picture. (Can you tell I'm tempted?) I need a bike to tide me over until my Tikit gets here, and I've been blown away by the pictures of the Twenty restorations and modernizations I've seen. I'd be very interested in that kind of project in a year or so, as I attempt to bring up my bike mechanics skills.
Btw, your Twenty sounds great! Have you got pictures on the net?