Vintage Omega 18K Rose Gold Chronograph Cal 321 Help Needed

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Dear Omega lovers,

i have been offered a very nice and pleased vintage chronograph in 18kt Rose gold but i must admit the near 0 knowledge about those birds...So please kindly help me on this one...I found only similar model when doing my homeworks but dial is different,with paint logo while the one i ve been offered has an applied Logo with 1,7xxxx serial number which dates it from 60 s...I thought those were produced in 40 s but the seller claims they were produced until 60 s area..
Any red flag or infos you yould share will be higly appreciated..
Here s all the pictures i have.
Thank in advance for the help,

A.
 
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Need inner caseback photo and better dial photos.
 
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Thank you for your help...Just request those to the seller..As soon as i will get them,will forward them..