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  1. Andrew C Apr 30, 2021

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    Hey all.

    Looking for a quick spot view on something. Sub arrived today, it's from 1968 and a 5512.

    Q, I think I am just being overly cautious, but how long would you expect the original tritium lume to glow after being placed in sunlight.

    I would say that within about 2 mins it is basically impossible for me to see the dial markers any more after sitting in a well lit room and then going to a pitch black room.

    Does that feel about right?

    This is the UV lume shot I got from the seller, and it looked even and good to me.

    My Pogue has way less lume (it’s just a dot) and fades after about a minute.

    upload_2021-4-30_12-15-32.png
     
    Edited Apr 30, 2021
    mountainunder likes this.
  2. timoss Apr 30, 2021

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    Two minutes is actually quite long for vintage tritium...
     
  3. Andrew C Apr 30, 2021

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    Apologies for the bathroom shot haha.

    Video below. Basically at 1 minutes it's really hard to see with my eyes. Phone sensors are a little better.

    2 minutes was probably a little over estimation...

     
  4. Nobel Prize Spell Master! Apr 30, 2021

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    For a 1968 tritium dial? You're lucky it even glows for 10 seconds.
     
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  5. Andrew C Apr 30, 2021

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    Ok. I feel a lot better.

    Hit up Eric Wind (windvintage) - not the seller I purchased from but a seller I trust wholeheartedly and have done a chunk of business with - and he had the following to say (I sent him the vid):
    "There is a batch with zinc sulfide supposedly in the lume that glows for a long time in that serial range"
    Then he asked for the first two digits of the serial: 17.
    Then he said "Cool, yes that is the correct glowing for that range".

    Found an article saying the same:
    https://quillandpad.com/2014/11/25/...5512-with-still-radiant-zinc-sulfide-markers/
     
  6. Dan S Apr 30, 2021

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    Yes, it should be a zinc sulfide dial, so it's ok that it glows. 1970s Rolex lume is generally pretty much dead.

    1966 on the left, 1977 on the right, a few seconds after UV excitation.

    IMG_0782.jpeg
     
  7. Andrew C Apr 30, 2021

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    Awesome, thank you Sir.

    Initially a total panic for me, but now see lots of them searching the web in the 66-68 range.

    In fact some sellers using it to make it sound super rare and exclusive haha. Any angle for a sale!
     
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  8. jaguar11 Apr 30, 2021

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    Similar to my 5512 which I have owned for longer than I care ro remember. Mine is a neat font in the 1666### serial range with the "puffy" lume.
     
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  9. Andrew C Apr 30, 2021

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    I am a really happy man this afternoon. Work, or stare at wrist... work, or stare at wrist
     
  10. jaguar11 Apr 30, 2021

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    Enjoy and wear in good health!!!!
     
  11. Nobel Prize Spell Master! Apr 30, 2021

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    This is all new to me. Amazing. I had a 1971 5512 and the lume was…. Not there.

    curious stuff.

    congrats
     
    Edited May 3, 2021
    Andrew C likes this.
  12. mrs_LA May 1, 2021

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    I have a '66 as well that glows brightly. I suppose when you consider 3-4 years of glowing original tritium-marked dials to the number of years the lume is 'dead'... it is a rare lume application! :D
     
    Andrew C likes this.
  13. Meyrin May 1, 2021

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    Interesting! I thought that pretty much all tritium lume dials are dead by now. Certainly the lume on my 1996 Sub 14060 (SWISS - T < 25 on the dial) is completely dead, and has been for some time...!
     
  14. Dan S May 1, 2021

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    The lume is dead on these zinc sulfide dials since they are more than four tritium half-lives old, but the phosphor still responds to excitation.
     
  15. Chris75 May 3, 2021

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    It glows exactly as it should.

    Absolutely correct for a zinc sulfide dial (that also matches the serial).

    Nice 5512 meter frist!
     
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  16. Andrew C May 3, 2021

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    Wrist shot from yeaterday.
    upload_2021-5-3_23-34-43.jpeg
     
    mountainunder likes this.