watch identification

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Given the expertise I found on this forum I thought I'd give this a try.

My mother passed away last year and I ran into this forgotten watch when cleaning up her house. Probably bought late 50's or early 60's, probably somewhere in the Caribbean. Runs fine, but for short periods of time (just 5-6 hours or so, but perhaps I'm just too careful trying not to overwind it). Could use some internal cleaning I suppose. Like the dial, that shows a few tiny spots.

I'm aware that the backplate needs to come off for proper identification, but all the instructions I've read thus far are side-wound in stead of this unusual back-wound watch. It is tiny: 15.5mm at its widest point of the case.

I've spend a good few hours trying to find out more about this watch but couldn't find much. The closest I found was this one, obviously also without serial number or other type or series indication.
https://watchestobuy.com/shop/omega-solid-gold-rare-cocktail-watch-1950s/

Right, pictures then. I'd be grateful for anyone's thoughts. Especially in terms of: would regular watchmakers know how to handle this micro thing or would it require a specialist? And is it worth the investment of having it serviced? I'm not interested in selling it, and although I'd never wear it I have it anyway, so I thought I might as well bring it back in good shape. Ideally I'd turn it into a project and do it myself; I like such challenges. But man, this thing is so tiny!

Edited:
 
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I am assuming the mechanism is an Omega calibre 440, backwinder. Do not, I repeat, do not try this job yourself! You asked if “any” watchmaker could do this repair. It would be beyond about 90 % of those in the business today, that call themselves “watchmakers”. I refer to those whose skill set is limited the changing batteries in quartz watches. How do you go about finding someone who would be qualified to professionally service this tiny little movement? Give us a general,idea of your location, and maybe someone can make a recommendation.

 
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Thank you for your comments Canuck, and providing some useful information.

Yes: I was afraid of that. I'm skilled enough with micro electronics, but this is probably a whole different game. You also confirmed my worries about regular watchmakers.
I'm located in Amsterdam, The Netherlands. Was thinking I may soon pay a visit to AWC and see what they have to say ( https://www.awco.nl/repairs/ ), or else AVW, although I think they don't service watches that were not sold by them ( https://amsterdamvintagewatches.com ).

Again: thanks for the analysis. Just the type of information to get me Googling again for additional info. Like the bracelet, type of gold, significance of the '750'-stamp, the little sun-like symbol next to it, the extremely bright looking glass, etc.

Cheers,
 
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The .750 means the case and bracelet are 18-karat gold alloy. Pure gold is 24-karat. Divide 18 by 24 and the result is .750. The watch is probably part of the Omega “Sapphette” series, though I haven’t seen that particular model as part of that series. The crystal is not glass, it is synthetic sapphire, and the edge has been faceted in the traditional lapidary faceting technique which results in a jewel-like aspect. Before you get too far spending a bunch of money on it, you might have a goldsmith check out the hinge pins where the links join. The 18-karat alloy would lead me to believe the hinge joints are quite worn. This was a very expensive watch in its day, and it would be a shame to lose it.
 
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I’ve never seen one of these backwinders, thanks for sharing
 
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Another thank you, Canuck. Very useful.
I'll find a goldsmith so.
Attached, daylight pics.
 
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img_6693-jpg.1320356

That Guilloche is truly great
 
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I scrolled past the photos when this was posted yesterday and thought the OP just laid the crown on the back of the watch to take the photo. Very cool watch to see.
 
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The back wind feature is generally found on very tiny mechanical movements where there simply isn’t enough room to accommodate a typical stem wind, stem set mechanism. The Omega calibre 440 movement is only about 13 mm in diameter, or a bit over 1/2 an inch. The back wind feature is also seen on some “baguette” shaped movements (i. e. long and very narrow). The le Coultre Duo-Plan is one of these baguettes with a back wind system.



You may have noticed that the screw in the middle of the Omega crown has several slots cut into it. Reason? That screw is a left hand thread! A right hand thread screw could come loose from the winding action.