broken omega constellation

It's a snap back Constellation Calendar
(You can google this for images/info)
The case looks quite nice
The bracelet looks quite stretched
The dial and indices look to have some patina
The hands are the wrong shape
Yes it's gold on the back but just decoration and worth very little

As mentioned above we could do with current clear pics, dial, case, movement, inner case back, for a better evaluation
Hope that helps

Well on the basis that you've been moving it around and the second hand hasn't moved, the watch isn't working
It's automatic so if you gently tip it back and forth it should wind itself
As I said it's a quite nice case and the dial isn't bad
In working order it's a quite desirable watch but in this condition value is in the lap of the gods

If you're looking to sell, you could put it on EBay as a watch for repair and see what it fetches

Like @ConElPueblo i think it should realise more than your predicted £200

I should add the watch is worth fixing and if no major parts are required it'll cost around £250 for service and crown
The indices can be cleaned
Just don't let anyone polish it or clean/refinish the dial