I won't claim to be an expert on Panasonics. For $100, I think you got a deal. What could you get for it? I don't know. It's got Tange #2 tubing, it's in good shape, and it looks like it has the original 700c matching wheels. Those are all +'s. My guess is that it really depends on your market. You might be able to get as much as $250, but $175-$200 seems reasonable. We're coming into winter, so it's not a great time to be selling a mid-range bike.

My 2 cents:
Others will know more........

Tim