Help identifying a vintage watch

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Hello,
This watch was given bought by my grandfather which was given to my father which was given to me. I am presuming this is likely before the 1970s. I believe the serial number is worn off. The watch itself is in poor condition and we are looking at remastering it.
Any help is appreciated,
Thanks
 
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The serial is on the movement. Have a watchmaker open it, take photos of the movement and inside the case back, then post them here.
 
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The serial is on the movement. Have a watchmaker open it, take photos of the movement and inside the case back, then post them here.
Hi,
The reference number is 131.0003 and the Calibre is 600.
Thanks
 
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The caliber 600 is a very rugged and reliable manual wind movement. It's probably the most accurate in my Omega collection.