I think that $1100 is just a little bit over what i'd pay for a club date in good condition.
However i did see one on my local classifieds 5 years ago go for an incredible $600, and it looked like a museum piece.. I couldn't contact the seller because he left no phone number or address, and i'm sure he was flooded with emails. It was almost a "too good to be true" scenario, and it looked like it could have been a "fake" ad, but he was selling other instruments at ridiculous prices, claiming in the ads that he knew what he was selling but they were priced to go fast because he was moving and couldn't take the instruments with him.. Whatever the case, someone snagged those club dates for $600 Cdn. dollars. Some people have all the luck.. If i were you, i'd go $800 cash and see what he says, but i'd bring an extra $200 just in case, cause $1000 bucks for a vintage Ludwig Club date is a pretty darn good deal if you ask me, at least here in Canada it is.. ;)