What Omega Seamaster model is this? Please advise

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Hello everyone,

Recently I inherited an Omega Seamaster from a great uncle who passed away. I've been searching all over the internet to indentify the watch, I have seen some models that are ALMOST identical, but not 100%. A rare thing to find for me is the small squared next to the numbers on the dial, combined with the two tone dial with gold colour on the inner circle of the dial. The rice-bead bracelet says gold plated 20 micron, but there is no serial number inside the bracelet. My great uncle was always careful and I think it's visible that it was always handled with care.

Do you have any ideas? I'm really interested from what year it is and what model it is.

Let me know!

 
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The reference number is inside the case-back. Most references have many dial variations, so the dial is not used as an identifier. So have the watch opened and share photos of the numbers inside the case-back and on the movement.
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Thank you for the advice. I will bring it to a jewelry store. The closest I could find online was a 351. Do you think the bracelet is original with the case?
 
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Thank you for the advice. I will bring it to a jewelry store. The closest I could find online was a 351. Do you think the bracelet is original with the case?
351 is the movement caliber. It is called a bumper automatic, which you can easily verify by gently shaking the watch. If you feel a weight bumping back and forth inside, the movement is a member of that family. However, that does not tell you the reference number of the watch.

It's really hard to be precise without more information. You haven't shown the back of the watch, the inside of the clasp blades, the back of the endlinks of the bracelet, etc. I would suggest getting photos of the inside and then showing all of the information comprehensively, that will help us give you the best feedback.
 
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351 is the movement caliber. It is called a bumper automatic, which you can easily verify by gently shaking the watch. If you feel a weight bumping back and forth inside, the movement is a member of that family. However, that does not tell you the reference number of the watch.
I do indeed feel that movement. And it starts to run for a minute or two after I do that.
 
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351 is the movement caliber. It is called a bumper automatic, which you can easily verify by gently shaking the watch. If you feel a weight bumping back and forth inside, the movement is a member of that family. However, that does not tell you the reference number of the watch.

It's really hard to be precise without more information. You haven't shown the back of the watch, the inside of the clasp blades, the back of the endlinks of the bracelet, etc. I would suggest getting photos of the inside and then showing all of the information comprehensively, that will help us give you the best feedback.
Here are some photos of the back of the watch.

 
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Looks like a 2577.

 
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Looks like a 2577.

I agree.

OP, this is known as a gold-capped case, with a shell of gold bonded to a stainless mid-case. You can see the stainless from the back of the lugs. The thick layer of gold holds up to wear and tear much better than a gold-plated/filled case.

The bracelet is, of course, gold-plated, and you can see the wear on the back side of the links. I honestly don't know if the bracelet is fully legit, since most Omega endlinks have a number engraved on the back. The clasp looks ok.