The only way to be sure is to take it to a watch repair shop.
I think you need to bring it to a jewelry or watch repair store to repair your IWC big pilot watch, or you can search how to fix it yourself, but I think it will be a lot trouble.
IWC pilot is a well known branded watch manufacturer which make aviator style watch to sell. These can be found to buy on websites such as www.jomashop.com.
You can get IWC pilot items at iwcpilotinc dot com. They have all their items for sale in wholesale prices for the general public. Visit them to learn more.
IWC Big Pilot watches are produced in Switzerland. The Swiss have been manufacturing fine watches for centuries. It should be a very well made watch which will last for years of service.
IWC stands for International Watch Company. IWC Portofino is a watch created by a man named Florentine Ariosto Jones in Schaffhausen, Switzerland in the year 1868. The IWC Portofino Collection can be found today at the International Watch Company in Switzerland.
The cheapest version of this watch series is probably the IW5002. Even though it is the cheapest it still costs proud 7000 dollar which might be cheap for a high quality watch.
IXC Big Pilot is an exclusive watch made for pilots and aircrews. These watches are very durable and reliable. There in a very informative review of this product at the following link: http://www.iwc.com
The IWC is a top of the line, luxury watch well known for its beautiful detail, smooth movement and top class finishing.
iwc aquatimer
IWC Flieger Chronograph 3717
The IWC online stores sell a large variety of their watches. If you do not want to purchase online you could also try the Watch Gallery, Prestige Time and Jomas Shop.
Govberg Watch Repair seems to be the most popular place to get your IWC Portofino watch fixed. I'm sure that your local jeweler could also get the parts needed.