Not much, but I like mine. Its a road/race type bike with the fittings to take rack and mudguard, an "audax" before its time. I doubt its worth a lot, espeacially as a previous owner covered it in dont-nick-me dulux paint.
Their tourers are supposedly very good indeed but Ive never seen one.
I think the problem is lack of familiarity. People want what they have heard of, wgich is what was publicised and available; a bit like cars, people pay more for a rusty retro fiesta than a perfect reliant convertible.
What are the dimensions, details etc ? Might be worth my while to have yours instead of trying to clean mine up.