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Looking for Universal Geneve signed crown tap 10 (0.9mm stem) for polerouter

  1. emilycestmoi

    emilycestmoi Jan 4, 2020

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    Hello all!

    Trying to track down a UG signed crown for my polerouter 215. Tap 10 (0.9mm stem). Can anyone point me in the right direction?

    Thank you!!
     
  2. Timo832000

    Timo832000 Jan 4, 2020

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    I am looking for a original crown for my Polerouter 20360 - 2 (also Cal. 215) too.
    Which one should match it and how can I be sure to pick up the right one?

    king regards,

    Timo
     
  3. emilycestmoi

    emilycestmoi Jan 4, 2020

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    It will have the vintage style U logo with a shield around the U. I believe it's approximately 4.5mm x 2.5mm, sits flush against the body and has a gasket inside the crown. The most important thing is the tap size, it's tap 10 (meaning takes a 0.9mm stem).

    Honestly I'd be happy with any UG crown with the right tap size.

    Lemme know if you find anything!
     
  4. CafeRacer

    CafeRacer Jan 4, 2020

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    The correct crown for a Polerouter/Polarouter is specific to the model reference number.
    https://universalgenevepolerouter.com/guide-to-locating-model-reference-and-serial-numbers/
    All stems are the same thread for most (if not all) Polerouters (and UG perhaps) from this era.

    Emily - what is the model reference of your Polerouter?
    Timo - a 20360 should have the larger domed style, one that fits over the case tube of the 20360 and is 5.20-5.25mm diameter.

    There are some crowns that look very similar on the outside, but are not interchangeable between references due to the internals and different sized case tubes for different references. They will fit the stem of course, but will not fit over the case tube... Ive run into problems a couple of times but have not yet gotten to the bottom of it (the differences are very small).

    EDIT: Here are a couple of examples of what I believe to be the correct 20360 reference crown.
    They wear down and become more rounded around the edges, but the two here look quite sharp/new:
    https://shop.hodinkee.com/products/a-1950s-universal-geneve-polerouter-automatic?variant=31678302468
    http://claremontvintage.com/shop/watches/ug_44/

    Hope this helps...
     
    Edited Jan 4, 2020
  5. emilycestmoi

    emilycestmoi Jan 4, 2020

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    Thank you CafeRacer. I'm not sure of the exact reference of my polerouter, but it's a cal 215 first gen (post patent pending but not a 215-1), also a no date. Guessing 1959-1960 vintage.

    I actually had the original crown for my watch, it is domed and like the ones you've linked, but unfortunately the stem broke flush in the crown and it can't be salvaged. I don't have calipers but it seems to be around 4.5-5mm in diameter.
     
  6. CafeRacer

    CafeRacer Jan 4, 2020

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    The crown can definitely be salvaged! Don't throw it away...
    The stem is made of a different alloy of iron that can be selectively oxidised out of the crown.
    There are many methods people swear by, but i've succeeded in removing a broken stem from a Polerouter crown by soaking it in concentrated bleach for about 6-8 hours, and periodically scratching out the rusted stem remnants with a pin (every hour or so...).
     
  7. emilycestmoi

    emilycestmoi Jan 4, 2020

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    Oh wow, thanks for the tip. I will give it a try!
     
  8. CafeRacer

    CafeRacer Jan 4, 2020

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    ...And if your Polerouter case diameter is 33.5 mm diameter, it is probably a 20357-x, if it is 35.5 mm then probably a 20360-x.
    Or even easier, in this case, you can discern between the two by the lug width (18 mm for 20357, and 19 mm for 20360).
     
  9. emilycestmoi

    emilycestmoi Jan 4, 2020

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    I believe it's 33.5mm, I measure 34mm by measuring tape. Also I have a 18mm strap on it now and it fits well, so I'm guessing it's a 20357.

    Crown is soaking in bleach now hoping this works
     
  10. time flies

    time flies Jan 4, 2020

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    Doesn't alum play into the formula somehow? Or perhaps another method employs alum?

    have fun
    kfw
     
  11. emilycestmoi

    emilycestmoi Jan 4, 2020

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    Half the stem is gone from the crown!! The bleach is definitely working. Hopefully the threads are good after this. Thank you so much CafeRacer!
     
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  12. redpcar

    redpcar Jan 4, 2020

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    Concentrated bleach sounds very aggressive (and stinky). I use Alum. You can buy it in the spice section at your local grocery store. I fill a shot glass with water and add about 1/2 tsp of alum, stir and simply drop in the crown. (cover the glass with a lid to keep evaporation down). It takes days but safe. The steel stem slowly bubbles away to the point where it looks like it was never there. Many others on the list do the same. Never failed for me.

    upload_2020-1-4_21-55-34.png
     
  13. CafeRacer

    CafeRacer Jan 5, 2020

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    Bleach is not a problem on steel crowns - it has a better reduction potential than than alum and is much faster, and the bleach will not oxidise the steel whilst there is any stem left in the solution.
    The odour can be strong (leave it to soak in the bathroom?) and be sure to rinse/soak in tap water afterwards to make sure there is no residue left on the crown.
     
  14. vibe

    vibe Jan 5, 2020

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    You should rinse in a mild acid solution after the bleach. Vinegar or citric works.
     
  15. CafeRacer

    CafeRacer Jan 5, 2020

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    thorough rinsing with tap water is more than enough
     
  16. redpcar

    redpcar Jan 5, 2020

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    What about the bleach's effect on the rubber gasket inside the crown? Chlorine attacks rubber.
     
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  17. CafeRacer

    CafeRacer Jan 5, 2020

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    ...remove the rubber gasket. :thumbsup:
     
  18. emilycestmoi

    emilycestmoi Jan 5, 2020

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    A polerouter crown is saved! Yes, I took out the rubber gasket as CafeRacer said. Worked very well! Thank you so much!
     
    20200105_213159.jpg