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OP, Definitely follow the above advice. You have a special watch that is highly sought after. I do want to distinguish one thing that alot of people make the mistake of doing. You may know this, but many in your position do not. DO NOT go to just any jeweler for this. If you want to get it opened and find out more information, do your research and seek out a well regarded watchmaker. If you take it to a random jeweler, I almost guarantee they will not know what you have and sometimes they are just as likely as hacking up the case trying to open it. This is not a watch that you want some random person at a jeweler store attempting to open and risk potentially ruining.
Thank you for everyone's insights. I have uploaded two more pictures. I have the challenge of my local watchmaker being closed due to the UK Covid lockdown. Does anyone know the best way to proceed to get the watch checked by an expert? Many thanks again.
You must not sell this Omega. A good service with a trust watchmaker and enjoy it. By the way, what happened at 5?
What do you mean 5?



It's a nice one - happen to be working on one now...
The important thing is not the number of teeth the opener has, but the watchmaker you choose. A competent watchmaker can open the case without any damage, and without any 6 pronged openers.
This is likely what the inside of the case back will say...
Movement shot...
I would recommend you contact our own @ChrisN here on the forum, who is in the UK and could assist with this watch I'm sure.
Cheers, Al
This is a very special watch. Be aware that this type of bezel becomes fragile with age and doesn't often survive in this near-intact condition. If the watch were mine, I would send it to Simon Freese in Essex for a complete overhaul. Not the cheapest, but the best and well worth spending the extra on for a watch of this rarity and value. It's a fabulous heirloom, to be treasured and kept well away from rough treatment. But if you are not sentimentally attached to it and would rather have the money, there are plenty of members here who would love it (I'm not in the market) and this would be the best place to find a buyer. You aren't allowed to post in Wanted To Buy without 200 posts, but I'm pretty sure that any potential buyers would find you regardless.
BTW what the other posters mean is, why is the 5 o'clock marker a different colour to the others?
PS Whatever you do, do not under any circumstances send it to Omega for servicing.
Hi everyone, thank you so much for your advice so far! I am now thinking of keeping the watch and want to get a bracelet that is either original (a long shot I know) or looks like the original. Any suggestions on how best to obtain one?
Buying the correct bracelet, especially with the correct original end-links, will be a very expensive proposition. But if price is no object, it can be done. I think you would want a 7912 with #6 end-links. Regarding reproductions, I think that Uncle Seiko makes some flatlink bracelets with 19mm end links.