Forums Latest Members
  1. rogart ray it again, Ram. Jan 14, 2016

    Posts
    1,007
    Likes
    408
    I am servicing a Seamaster 165.024 . We are wondering about the crown? Is this a Naiad crown? Shouldn't there be a star inside the Omega logo?
    DSC05341.JPG DSC05340.JPG
     
  2. efauser I ♥ karma!!! Jan 14, 2016

    Posts
    8,644
    Likes
    14,210
    It actually looks like the Mercedes symbol.
    [​IMG]
     
    rogart likes this.
  3. Kringkily Omega Collector / Hunter Jan 14, 2016

    Posts
    5,505
    Likes
    4,781
    No the only times there was a mercedes crown as the older 2913 and 2914
     
    Edited Jan 14, 2016
    Baz9614, OMGRLX and nickw like this.
  4. rogart ray it again, Ram. Jan 14, 2016

    Posts
    1,007
    Likes
    408
    Anyone now how they works? Only found some old crowns on Ebay . Old auctions . http://www.ebay.com/itm/Vintage-Ome...master-300-2913-Railmaster-2914-/191737659591Purchases made through these links may earn this site a commission from the eBay Partner Network
    http://www.ebay.it/itm/genuine-omega-crown-NAIAD-rose-gold-5-5mm-/161937896994Purchases made through these links may earn this site a commission from the eBay Partner Network
    Found this but there isn't any more pictures so it's hard to see if it's really is a Naiad crown or there is a star?
    http://www.ebay.it/itm/Omega-Seamas...hash=item4887f718dc:m:mMzCzPhtPf0mz534K4jE32APurchases made through these links may earn this site a commission from the eBay Partner Network
     
  5. watchknut New watch + Instagram + wife = dumbass Jan 14, 2016

    Posts
    4,025
    Likes
    13,789
    Don't know how to describe it, but here is an original Naiad from my 165.024 1966 vs the replacement on my 1967 model. The originals have a an Omega symbol with tighter feet, as well as grooves that cut into the back of the crown...don't know how to describe, but others done so very well.

    I believe they work with internal gaskets whose sealing power increase under pressure...this was a design flaw because they didn't do a great job at shallower depths, and is the reasoning for the development of the screw down version.

    Original NAIAD on top:
    [​IMG]

    Original NAIAD on left:
    [​IMG]
     
    Seaborg, Baz9614, OMGRLX and 2 others like this.
  6. rogart ray it again, Ram. Jan 14, 2016

    Posts
    1,007
    Likes
    408
    The one i have must be the replacement as it looks like the bottom crown .
     
  7. Concorde Jan 14, 2016

    Posts
    118
    Likes
    67
    Also this pics shows noticeable profile differences between Huguenin Frères case and Le Centrale Boîtes.
     
    merchandiser and Giff2577 like this.
  8. watchknut New watch + Instagram + wife = dumbass Jan 14, 2016

    Posts
    4,025
    Likes
    13,789
    Yep, as covered in my previous thread with a full pictorial from all angles.

    They really are two very different watches when you see them in the flesh...it is quite interesting.
     
  9. kox Jan 15, 2016

    Posts
    561
    Likes
    2,562
    Just a few inputs on the "Naiad" term and crowns (Naïad = Greek nymphs living in Water ::love:: )
    Omega used the term first in 1937 on a watch called the Naïad. The first "standard" waterproof watch after the Marines watches. With a waterproof snapback case! and the first crown using a internal gaskets that sealed against the stem tube.
    This was then refined on the first gen SM300 watches. The 2913 came with a crown system that was named Naïad. Still using internal gaskets that sealed against the stem tube, but a more advanced design where the seal went tighter the more pressure it got (see catalog picture below fra "old-omega.com"). These crowns were used also on the 2. gen SM300 (165.024) until Omega introduced the screw-down crown on these in the late 60'ies. The Mercedes mark was found on some late 50'ies crowns, both on 2913, -14 og -15 and some others. The mark has NOTHING to do with the Naïad system or name. This is a common misunderstanding. It's is just believed to be a sub-manufactorer mark. Below is my 2913 Mercedes crown pictured. Remember that the SM300 crowns are a bit smaller than the speedmaster ones. Almost same diameter, but the deepth is shorter. And of course the stem size is different. Tap 0,9 on the SM300, on the speedy 1,0 and on the railmaster 1,2
    The flat feet crown posted above is the original one found on both 1 and 2. gen SM300 upto late 60'ies. The OP's one is the replacement crown.
    On a side note regarding the waterproof issues with the Naïad sm300 crowns. You can read most places, that the reason why Omega introduced the screw down crown was because the Naïad crown had a design fault, where it leaked water at shallow deepth because of not enough pressure to make the seal system work. This is actually not correct, it was because the gaskets wasn't replaced/serviced in time/got old and stiff on many watches, not because of the system. So it was more because of customer perception and the fact that Rolex subs had screw down, that Omega shifted to the screw down.
    2913 14755 ad.jpg

    ash general vintage.jpg
     
    Seaborg, OMGRLX, milhouse and 7 others like this.
  10. watchknut New watch + Instagram + wife = dumbass Jan 15, 2016

    Posts
    4,025
    Likes
    13,789
    And this is why I love the forums, thanks for that clarifying post, as I didn't know the gaskets could be replaced in the crown.
     
    Seaborg likes this.
  11. kox Jan 15, 2016

    Posts
    561
    Likes
    2,562
    Thanks. But I didn't meant that the gasket itself could be exchanged. Just that it was the gasket that was the fault. Normally watchmakers just replaced the whole crown as a new crown had/has the gasket inside. Separate gaskets for these crowns are not avaiable as far as I know.
     
    Edited Jan 15, 2016
  12. watchknut New watch + Instagram + wife = dumbass Jan 15, 2016

    Posts
    4,025
    Likes
    13,789
    Gotcha, makes sense. As long as the gaskets were good, the system worked as designed.
     
  13. Archer Omega Qualified Watchmaker Jan 15, 2016

    Posts
    26,343
    Likes
    65,049
    This system is still used today on many watches and it works just fine. I know many people believe you need a screw down crown on a dive watch, but that's really Rolex marketing tainting everything as usual...
     
    heavenscloud, marco and marturx like this.
  14. rogart ray it again, Ram. Jan 16, 2016

    Posts
    1,007
    Likes
    408
    What if i buy a new crown from Cousinsuk? Do i get the Naiad crown or a ordinary Omega crown ? Omega 42028ST . It looks the same as the one i have in the picture?
     
  15. kox Jan 16, 2016

    Posts
    561
    Likes
    2,562
    ST42028 is the correct replacement crown. The screw down is 42062.
     
  16. Archer Omega Qualified Watchmaker Jan 16, 2016

    Posts
    26,343
    Likes
    65,049
    They are one and the same...
     
  17. milhouse Jun 25, 2018

    Posts
    278
    Likes
    91
    I'm going to look for an original and vintage Naiad crown for my Seamaster 300 ref. 166.024-67.
    Which are the correct and exact features (diameter-deepth-stem size/tap) of Naiad crown for 166.024?

    Thank you
     
  18. rogart ray it again, Ram. Jun 25, 2018

    Posts
    1,007
    Likes
    408
    Omega # ST42028 is 6.7 mm in diameter and 3.15 in height, Tap 10 for a 0.90 mm diameter thread stem. So the Niiad crown should have the same size. But look above to if you want a real Naiad crown . You should be looking for a crown with the tighter feets on the Omega logo. be prepared to pay some money for it.
     
  19. jimmyd13 Jun 25, 2018

    Posts
    3,147
    Likes
    7,133
    This phone really hates photographing small, shiny things but this is the original crown ...if you really want to go all original?
    IMG_20180625_1643327.jpg IMG_20180625_1639490.jpg IMG_20180625_1639586.jpg IMG_20180625_1638342.jpg
     
  20. kox Jun 25, 2018

    Posts
    561
    Likes
    2,562
    Well, the 166.024-67 was not delivered with a Naiad crown, but a screw-down. Modern ones are part no. ST42062 as mentioned above. Tap is still 0,9mm. And if I remember correct size about 6,4mm x 5mm. The vintage versions are hard to find, are just about same dimensions, but has a smaller logo - like below:

    166.024 krone sd gl lille logo.JPG
     
    speedamatuer likes this.