Identification Help For Vintage Seamaster

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This is my fathers watch. He had bought it 30 years ago from a dealer in NY. Dealer told him it was solid 18k Rose gold. Anyone have any info, reference number or even ballpark price evaluation?
 
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You will need to take the watch to a watchmaker and have it opened. Then take pictures of the movement and inside of the caseback.

Although I see an 18K hallmark on the outside of the caseback that could be South American in origin. Either Argentina or Brazil.



Many Omega movements were imported to those countries in the 1950’s and put into locally produced gold cases.

Hope this helps,
gatorcpa
 
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Hey gatorcpa,
Thanks for all the info! Sadly, my father somewhat against opening the caseback (he hasn't serviced it in 4 years.)
 
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Hey gatorcpa,
Thanks for all the info! Sadly, my father somewhat against opening the caseback (he hasn't serviced it in 4 years.)
unfortunately its the only way to know for sure
 
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I'm going to guess at a 266 movement in there, from the style of the hands and the similarity of the case to the 2605.

 
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Thanks everyone for all the awesome info! Edward53, are these cases made in Argentina less or more valuable than those made in Switzerland?