Take it to your watchmaker.

 

+ whatever the count is now.

 

I concur with Watchbreath, take it to a knowledgeable watchmaker.

 

English is your third language?!! Your English is better than most Americans. Like @Watchbreath said, it just needs a trip to a watchmaker. It could be something very simple to fix like a broken mainspring

 

I assume it's not running? Or if so will only tick for a few seconds?

People used to refer to this as "overwound", when you are unable to turn the crown to wind the watch. Typically it's due to the mainspring already being fully wound and as such not allowing for anymore turns.

As the movement won't run it doesn't have a chance to uncoil the mainspring through it's typical function.

With a pocket watch, typically this means a broken balance staff or cracked jewel... but it could be something as simple as just needing a good cleaning to get going again.

Any watch repair center should be able to diagnose the specific problems quite easily.

Good luck and enjoy the care taking of your grandfathers watch!

 

It is not something you can fix yourself. Take it to a watchmaker with the experience in vintage pocket watches.

 

Thanks for your responses. I will take it to a watchmaker this weekend.

 

Agree with the above suggestions. Let a pro inspect it.