Elegant older lady

Hi all, I am a Newby to this site and a recent convert to watch collecting. I have just acquired this lovely Omega cocktail watch and have not been able to find out much about it apart from what I have detailed below If any members can help with some further ID and year of manufacture approximately I would be very grateful.

What I know so far, (please excuse any incorrect terminology as I am only new to this hobby).

Ladies Omega cocktail watch
Casing and bracelet is made by Handley for Omega in 9ct solid gold.

Sapphire face crystal 14m square, (unmarked). Dark cream satin face, two gold hands and gold Arabic numerals, with minute indicators on face border

Case 16mm square 9 ct gold -
Bracelet crafted in side plate and pin construction 9 ct gold with 9 ct gold safety chain

Weight of case and band (minus movement) 19.68 gms 9ct

Service marks on case back

I am trying to get an idea of the manufacture period and a model name if possible. Sorry for not framing my question better.

I am not a watchmaker and have been reluctant to do more than remove the casing back I am unsure of how to remove the movement from the metal jacket as it is fragile from the look of it. The metal cover seems to be tight around the stem of the winder.

I am not a watchmaker and have been reluctant to do more than remove the casing back I am unsure of how to remove the movement from the metal jacket as it is fragile from the look of it.View attachment 1744356 View attachment 1744356

Thanks Jim,
I will try and find a watchmaker when down in Melbourne, who can open it up and allow some pictures of the movement. I appreciate your comments.

Nice simple watch. I’m concerned about the condition of the movement though based on the regulator arm in the opening and image above of partial movement

could be a caliber 484 and if in poor condition. Readily available on EBay , but check overall condition (finishing and running), price and s/h cost.

if yours is running, but needs a major overhaul due to condition. You might want to consider replacing it

Thanks to all who have helped with this. I removed the movement after some research and the picture is below. The serial number is 10727193 and the calibre is R13.5. I believe this means it would have been manufactured from the 1940's to late 1950's as Jim in Oz mentioned..

The watch seems to keep very good time over a day (+/- around a minute from observation only).
The face needs cleaning and the mark at the lower right corner fell of when touched lightly.

I will look at finding someone who can give the mechanism a birthday and improve the face and hands to restore the old lady to some of its former glory.