18K vintage OMEGA help

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Hello to all OMEGA enthusiasts, this Omega was given to me by my father about 40 years ago, apparently it belonged to my grandfather, in my family it was always known as grandfather's gold Omega, in the 80s I lived in London and I visited the Omega store on Bond Street to have it cleaned, I was a kid at that time and when they returned it to me and after paying for the service they recommended that I be very careful with the watch because it was very valuable, from that moment on that is what I did and I stopped wearing it daily and started wearing it only on special occasions, I wore it to my wedding and other important events. Today I remembered it and I just wound it up and it works perfectly. I started looking on the Internet for some information about the watch but I couldn't find much. The watch doesn't seem to be a standard model. My family is Spanish and I have a vague memory of something about the watch having been made or assembled in Portugal for some gold reason at that time but I never really knew the history. The thing is, I would like to know if anyone knows about this type of OMEGA watch and be able to identify it, to find out something about its history, its year of manufacture and its value, although for me it will always have a special value and logically my children will inherit it and I have no intention of selling it, but I do want to know its value and origin/model. Thank you very much for your help.

 
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The story about Portugal makes sense. There are other posts on this forum mentioning that the Portuguese government would stamp the lugs on gold watches when import duties were paid. Here is a blow-up of the inside of one of the lugs:


There is your tax stamp.

The serial number dates from about 1940. The movement looks to be a cal. 30SCT2. Given the spacer in the case, it seems to quite large for that era, maybe 36mm diameter or more.

The dial looks like it may have been refinished at some point, but for a family heirloom like this, that’s not important. The value is going to based on the gold value, similar to any other gold watch these days.

Hope this helps,
gatorcpa
 
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Hello, I was away from the net, wow that info is valuable, thank you gatorcpa, very interesting I will keep taking care of it and hopefully my daughter after me, thank you again
 
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I feel like the entire watch might be custom-made, except for the Omega movement? The hands and dial are certainly not factory original, and there are no Omega or maker markings inside the case-back. Perhaps there is a Portuguese import mark on the lug, although that might also just be a dent.

Also, is the case truly gold, or just plated? There appears to be base metal showing in spots on the backs of the lugs, unless that is dirt.
 
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The Portuguese stamp should be on the front of the upper left lug. On some chronographs I’ve seen that stamp also between one of the pushers and the crown
 
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The Portuguese stamp should be on the front of the upper left lug. On some chronographs I’ve seen that stamp also between one of the pushers and the crown
Here's the Portuguese mark on a steel Omega case (photo stolen from eBay):

 
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There is no marking on the front of the lugs, It's definitely solid gold, yes, it's a bit dirty, maybe I should send it for service/cleaning, certainly it looks kind of hand made, just look a that logo, even the roman XII and all the engraved numbers, the supposed portuguese marking is tiny I am not an expert, but looks like a dent, it's not easy to take a good pic of it, but I may be wrong,