Old Omega identification

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New member and need some help,
I found the old omega of my grandfather, still functioning and keeping the time with great precision,

It should come from 1950/1960s,
Any ideas?

 
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Maybe a Calatrava from earlier 1950s?
Omega never built a Calatrava.
Its a nonsense which several dealers semantically use to make a watch seem more valuable.
Calatrava is a term restricted to some models of Patek Philippe only.
 
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If the identification and dating are important, please have the watch opened and post good photos of the inside of the watch, including any numbers on the movement and inside of the case-back. Otherwise it is just guesswork since there was so many different references made.
 
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If the identification and dating are important, please have the watch opened and post good photos of the inside of the watch, including any numbers on the movement and inside of the case-back. Otherwise it is just guesswork since there was so many different references made.
I found this, looks the same:

 
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That watch is completely different. You want to compare the cases, not dials. Each reference was made with many different dial variations, and the same (or similar) dials were often used in multiple references. That second watch isn't the same anyway, different markers and the sub-dial is much farther from the bottom, so probably a larger case.

Respectfully, if you don't know what you are looking for, take my advice and have it opened up. If it's important enough to you. Or just keep playing around on the internet.
 
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Is it just me, or does Hal (sorry, Richard)9000 not have a superhuman ability to find superficial associations using the internet? What was grandpa's profession, I wonder?