Good to see more Swedes coming here!
As for your questions:
1. Is it an authentic world time?
- The inner disk do not match the outer disk.
2. How much do you think I should offer?
- Sorry, we do not discuss prices here.
3. Can the damage on the dial be cleaned without further damaging it?
- To some extent but it will still be a "repainted" watch.
Best
Blomman