Nice find. Am I right in thinking that is a RGB display, the kind that was used mainly on the II's? Looks like the 6100 has been kept in damp, humid or corrosive conditions with all that rust on the bottom. Hopefully this won't have affected the innards.

I'd like a 6100 as it's got an attractive, low profile case. Unfortunately I just don't have any space for more Macs!