Help me to find out some information about this watch

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Hi everyone, I inherited this vintage Omega and would like to get more information about it, such as the year, model, reference number, and any other details. The stain you see on the dial is just glue residue from Scotch tape, so it can be easily removed.

 
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It's a nice looking watch but why did you not clean the crystal before uploading the photo. Get a watchmaker to open the back of the watch and all will be revealed including the watch calibre and omega reference plus the year of manufacture. Then do some research and come back.
 
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It looks like a mid 60’s 320 caliber Chronograph. Possibly reference 101.009.
 
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Andra, it is a valuable watch and you should get it serviced at a watchmaker specializing in vintage watches.
Do NOT agree to have it sent to Omega in Switzerland.
And, as @peterkirk01 says, have the watchmaker flip it open, take two photographs of the inside of the caseback and of the movement and post them here. That's all the research needed.
 
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Welcome,
You can remove the stain with shoe-polish (cream). Where are you located?
 
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Nice watch, looking forward to seeing better photos.