Need help with 1680 tropic sub

[drainaps]

I'd go for a minimalistic restoration. Do what's absolutely required to get it back in shape, including servicing the movement, crown and tube and crystal. I'd go very soft handed on the dial, hands and date wheel. I'd definitely NOT repair the case. It has character.

While taking this approach will not get you the top slot at the next concours d'élégance, you'll have a nice watch to wear while sinking a reasonable amount of money. As Bum says, 40% of the value of any such watch is in the dial, and you're starting quite low here. There is clearly a point where you'll get diminishing returns for sinking additional money in this watch.

If you're looking at concours d'élégance status, you should start from a better base, hence from a different watch.