In its current state $125-175, for the big city, depending on the condition of the wheels, bb and hs, could be less if the bearing sets sound like rocks.

I sold one in similar shape, a few years older, at $150, but it had a dinged rim(toast) and the bearing sets were not rebuilt but was still smooth spinners. I did polish the frame and addressed the rust on shifters. The buyer was a French bike flipper.