It is a little too far gone. Would need a new movement (significantly corroded and would doubt there is much that can be reused) or a significant number of parts which would make it more expensive than a new movement, minute runner should pop up in time, bezel is just acceptable and a crystal would need replacing (yellowed) and case is damaged (bent lug). you could be looking at a pretty big bill but if you are patient, you could come out trumps ! after all it is a very rare and desirable aero-compax.
On that basis, i would think that 4K is high. Half of that is reasonable ...
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