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  1. Gstp Dec 6, 2017

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  2. w154 Dec 6, 2017

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  3. Syrte MWR Tech Support Dept Dec 6, 2017

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    Fabulous ... the duo, the video... thanks for posting. Early 90s? ::facepalm2::
     
  4. DirtyDozen12 Thanks, mystery donor! Dec 6, 2017

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    Bottom one looks to be the latest with no numbers on the back. Do you happen to know the reference number or first few digits of the serial number?
     
  5. Gstp Dec 6, 2017

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    Yup, numbers are on inside of case back, and last 3 digits corresponds with the lug number. Had to check for the serial, it's 8 231 XXX. Hope this is useful
     
  6. DirtyDozen12 Thanks, mystery donor! Dec 6, 2017

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    Thank you. My latest one has a similar back and crown though yours appears to have central seconds. The serial number of mine is 8'242'xxx.
     
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  7. w154 Dec 6, 2017

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    Early eighties I think...

    I had no horological input for the thread, so sorry it was the best I could do.
     
  8. Gstp Dec 6, 2017

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    and how could you tell from just viewing the backside ?
     
  9. DirtyDozen12 Thanks, mystery donor! Dec 7, 2017

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    Guess which one has central seconds.
    comp.JPG
     
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  10. Gstp Dec 8, 2017

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    Right
     
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  11. omegastar Dec 8, 2017

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    Are these Longines ref. 5411 ?