So I took the bike to a shop and they unfortunately were not so experienced with vintage Bianchi's, but did say, just based on the condition and geometry of the bike, that perhaps I could get anywhere from $300 to perhaps even $600. I'm thinking more in the $300 range, but I really don't know.

I don't suppose anyone could make a ball-park estimate on the retail value or validate the shop's conclusion of this bike given the pictures and info I have?