if they both are original and work,i would jump on them
So something has to be a score to make it worthwhile? I think that's an excellent price, fair for both parties, if all is working well.
The price is reasonable if both pairs are in working condition even if they need a little work. I think the Model 6's are worth that much. Read some owners comments on the KLH Model 6's.
I'm glad you decided to go for them. The Sixes are very much worth $60, even if you have to fix them up a bit. And let's hope they're later speakers and not sealed ones. =/