Question about Omega Seamaster Cosmic 2000
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Thread: Question about Omega Seamaster Cosmic 2000

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  1. #1
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    Question about Omega Seamaster Cosmic 2000

    Picked this up off Ebay and the seller described it as missing the bezel so there wasn't much interest in it and I ended up winning it. It's 38mm w/o the crown and the top ring with the lugs comes apart from the case and dial so there are two pieces. I'm confused about how these are supposed to be connected? Is there a missing bezel or is there maybe a ring that holds the two pieces together? Glue?

    I can't figure out how to get to the movement but I would assume a special wrench is required? The dial has a nice patina but the crystal is beat up and the watch doesn't run so I will take it in for service. I'm just curious what holds the two pieces together and is there something other than a gasket missing?

    Thanks for any help.

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  2. #2
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    Re: Question about Omega Seamaster Cosmic 2000

    Ref. ST 161.0128, introduced in 1972, cal. 1012. The OVD lists only a goldcap variant (CD 161.0128), but a short search in Google Images shows up the same watch as yours.

    The OVD states that the case back is a press-in, but since it can't be opened up easily, I'd say that it's a press-in compressor case. Which requires a different tool indeed.
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  3. #3
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    Re: Question about Omega Seamaster Cosmic 2000

    I looked at bidding on A cosmic 2000 last year until I discovered that access to the movement is via the front and one needs a special "Omega" crystal lifter.
    I have a few of front loader Roamers as well as a Tissot Regate all of which are two piece. On three of the Roamers the two pieces fit together under firm finger pressure and they stay there .On one Roamer the two pieces were held together by sealant .On my Tissot I am am bewildered as to why they will not stay together as they have only been separated once.
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  5. #4
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    Re: Question about Omega Seamaster Cosmic 2000

    This model of Cosmic 2000 is 166.130. The other is 166.128. The difference is in shape of lugs. Both made in steel and gold cap. 166.130 also has a 14k case listed. Single calender with Omega 1012 and doublecalender Omega 1020.

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    Last edited by Hessu; March 1st, 2016 at 06:21.
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  6. #5
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    Re: Question about Omega Seamaster Cosmic 2000

    I was under the impression that these cases are separated by removing the crown and blowing air into the stem tube

    Matt


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    Re: Question about Omega Seamaster Cosmic 2000

    [QUOTE=busmatt;26458698]I was under the impression that these cases are separated by removing the crown and blowing air into the stem tube

    They do indeed open by removing the crown and blowing air into them. Mine (166.130) I had to use a compressor and 10 bar to get it to open. I used a vice and some pieces of wood to support the midcase so I could open the back slightly and then "blow" the crystal out.

    And as to how the two case pieces are held together is via an o'ring; there is no bezel. If you look closely at the mid case you will notice a small groove. This is where the o'ring sits. Essentially the two are linked via a friction fitting.

    On mine the o'ring has a diameter of 0.75mm and an outside circumference of 34.20mm. I've looked around to get a replacement but Cousins doesn't list it so I'm going to use the existing one even though it is a bit chewed up.

    Thanks
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  8. #7
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    Re: Question about Omega Seamaster Cosmic 2000

    No, case is not be opened by air. You need Bergeon 6173 (heavy duty glass fitting press) and a lot of power. Sometimes the case has not been open since 70's and it is like superglued. Also there may be knocks on bezel and it makes opening more hard.

    About case numbers, also 166.131 was used (no visible alterings to 166.130).
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  9. #8
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    Re: Question about Omega Seamaster Cosmic 2000

    Hello! It's VERY difficult to 'imagine' that Omega would allow air to be blown into one of their watches: talk about moisture/ dust / etc. attacking the movement...there must be a tool that opens this case!! The hairspring would really hate it, too, yes?!

  10. #9
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    Re: Question about Omega Seamaster Cosmic 2000

    The air ok to do Al of Archer a well known watch repair guy on the omega forum would tell you he does it this way, but you can also use a crystal lift.
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