Is the Omega "original" service worth it ?
You received a reply above that implies that Omega service is no good or not worth it, and that's just not true.
The majority of these people are watch collectors, and if you're a watch collector, you want original pieces that have as many of their original parts as possible. If you were to send your watch to Omega for service, they may change parts that collectors do not want changed. In your case, they would likely replace the crystal and the crown, because these parts contribute to water resistance. But you don't know what other parts they would change.
Your crown is probably not original anyways, but a good watchmaker can hopefully find you one. You might be able to have the crystal polished, perhaps not. Your watchmaker will advise whether it's in decent condition. You will also want to let your watchmaker know if you plan to wear this watch every day.
In general, there are two circumstances where Omega factory service is warranted. First, the watch is new enough that it is not yet "collectible". In my opinion, something made in the past 20 to 30 years would qualify. Second, the watch has great sentimental value but shows a significant amount of damage. Perhaps the dial has been previously refinished, and poorly, and the hands are bent and there is no crystal. In that case, the watch has little monetary value from the collecting perspective, and a factory service and restoration would make it more valuable, not less. In this instance, however, it is rare that the increase in value to a collector would exceed the cost of restoration; it would be up to the individual to determine whether such an intervention is warranted.
You have come across a watch that has its original dial and the case is in very good condition. These two things are perhaps the most important when assessing a vintage watch whether to collect, wear, or both. The movement appears to be in excellent condition as well, and this series of movement is known for good timekeeping. A good independent watchmaker who has experience with vintage watches is the preferred choice, as mentioned above, and I am confident you will be able to wear this watch for some years to come, with regular service.
