The right thing to do is to wind the watch, not screw it!
The most expensive part of the watch is the crown, which is what you turn while winding it. If that is broken, you will need to spend a lot of money - say, about 8,000 rupees to get it fixed.
Important to remember is that if that watch is genuine, once you repair it (and don't screw it any more) you can probably sell it to a collector for a handsome profit.
These watches are not meant for knowing the time - for that you can use a Casio or something. These watches and pens are like jewelery - things you admire, wear 5 times a year and keep in a showcase.
