Ladies Seamaster, TV screen style

Hi all,

I have been researching a watch for my mother who inherited it in 2004, it has lived in a box since then and has only just been re-discovered.
Unfortunately there are no papers with it, just the watch.
From scouring the web I think I have it identified correctly but am reluctant to take the back off, I would rather take it to someone when things get back to normal.
I fully understand that a shot of the movement speaks a thousand words so will get one done if it is a must.
This is my attempt at identification -

International Collection
Seamaster, ST 766.0919
Cal 684
Bracelet 5956/ 251
1976-82



To my unskilled eye it appears to be genuine and in good condition but, this is where I need some advice from those with knowledge.
Does it look right ?
Should I get it cleaned or serviced ?
Would the cost of the above be worth it ?
No, this is not a what is it worth post but the watch will be liquidated at some point.
Not exactly sure what I should do next, any advice will be greatly appreciated.

Cheers
Ken

Looks fine to me (also not an expert) though Omega watches of this era are less valuable/collectible than watches older and more recent.

What you should do depends on your plans for it.
If your mother is going to wear and enjoy it, the cost of servicing may be worth what she gains from it.
If she wears it WITHOUT a service and lubrication, running it is likely to damage the movement.

On the other hand, if she's not going to wear it, but it will sit in a box until such time as its sold, your best bet is not to touch it at all since you won't recoup the service cost when its sold and, and you always risk something which might inadvertently damage its resale value.

@timecube , thankyou for the reply ang great advice.
The watch wont be worn, my mum currently wears an old 9ct Rotary with the small head.
This Omega would be far to " modern " for her wrist 🙄

@JimInOz , Awesome, pretty much answered everything 👍 Thx again