Trying to identify...

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Can anyone tell me the model number of this watch? I bought it in the 1970’s and recently found it in a drawer. I had it serviced a few years ago, but didn’t think to ask the watchmaker to advise the model or serial.
 
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You'll need to open the case up to get the ref number and serial number.
Reference # should be on the inside of the case back. Looks like it might be a 166.065?
Serial number will be on the movement. Ask your watchmaker to get a nice photograph of it for you.
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Handsome watch. Have someone carefully open the case back and snap photos of the interior of the case back (which includes the model number), as well as a photo of the movement. As has been said, that’s where you will find the info to definitively answer your question.