Omega Seamaster Screw down crown not closing

Take it to your authorized dealer or Omega Boutique before doing anything else. This could potentially be a sign of a very bad situation - the threads on the screw-down crown could be stripped.

When you say ceramic Seamaster, do you mean a steel watch with ceramic bezel, or a model with the ceramic case?

The difference will be in the case tube material, so the steel model will have a steel case tube and crown, where the ceramic model uses titanium for those parts.

It sounds like the case tube is like stripped - the threads are typically on the inside of the tube and when they are stripped, they look like this:



They should look like this:



Omega will replace both the case tube and crown - should always replace both when there's thread damage IMO. Is this the first watch you have had with a screw down crown? Typically stripped threads are not a big problem on Omega watches, but it can happen if you are not careful threading the crown back on. If you are just getting used to thread crowns down, you can press down lightly to compress the spring inside the crown, turn the crown backwards until you feel the threads click, then screw the crown down - this can prevent cross threading. You also do not needs to crank the crown down really hard - this does nothing to add water resistance, and only increases the chances of crown damage.

Cheers, Al

He hasn't been seen since Dec 31, 2020, so he's probably got it fixed and moved on.

or he put it in a drawer, forgot about it, and in 50 years someone else will post in the Vintage Forum, “I was just looking through my father’s things and found this old Omega. Is it real? How much is it worth?”

😉

I was trying to project a more positive outcome for the OP's watch but, yes, there is a good chance he was not motivated, or didn't want to spend the money, to fix the watch. I think we all know such people.