Mechanical WW Seiko BellMatic Stem

Discussion in 'Watch Repair' started by Grant Perry, Jul 23, 2018.

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  1. Grant Perry

    Grant Perry Registered User

    Jun 5, 2002
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    Hello,
    I have a Seiko Bell-Matic with a broken winding stem. It rusted/broke at the crown. Is there a parts listing that I can use to find a replacement?
    Thank you in advance.
    Grant
     
  2. Chris Radek

    Chris Radek Registered User
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    Apr 13, 2014
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    Assuming it's a cal. 4006A, the winding stem is part # 354805.
     
  3. roughbarked

    roughbarked Registered User

    Dec 2, 2016
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    If it broke at the crown from rust, you need the crown as well.
    I wasn't aware of a different caliber than 4006. Thought that was the only bellmatic.
     
  4. Grant Perry

    Grant Perry Registered User

    Jun 5, 2002
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    Thank you! It has 4006 and 6027 on the back of the case.
     
  5. Grant Perry

    Grant Perry Registered User

    Jun 5, 2002
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    And 4006A on the movement.
     
  6. Grant Perry

    Grant Perry Registered User

    Jun 5, 2002
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    Is there also a part # for the crystal, or is it simply replaced by size?
    Thanks again.
    Grant
     
  7. dAz57

    dAz57 Registered User

    Dec 7, 2011
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    Seiko case numbers are always written as 4006-6027, not two separate numbers,

    Crown 55M22NS
    Stem 354805
    Glass 325T02ANS


    20180724_143406.jpg
    20180724_143410.jpg
     
    cradek likes this.
  8. Kevin W.

    Kevin W. Registered User
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    Apr 11, 2002
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    I work at the Veritas Tools machine shop.
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    They are nice watches Grant, is it yours.
     
  9. roughbarked

    roughbarked Registered User

    Dec 2, 2016
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    I've got three or ids it four Bellmatics. Unfortunately they all have some rust in them. The first one I had given a new champagne dial and managed to lose it in a peach orchard. A few years later the farmer pushed out the peaches and found my watch hanging on a tree root. He gave it back to me but sadly it had got some water in through the alarm button. I've rebuilt it again from parts from one of the others. I wanted to rebuild it because I had added extra jewels in the first instance.
    Don't think anyone else has a 20 jewel Bellmatic.
     
  10. Al J

    Al J Registered User

    Jul 21, 2009
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    Or he could dissolve the broken part of the stem out of the crown with an alum solution - I do this all the time to save crowns...

    Cheers, Al
     
  11. roughbarked

    roughbarked Registered User

    Dec 2, 2016
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    Why is the stem rusty? Where did the water get in?
    OK yes replacing the seals my help but nothing works as well as a new crown.
     
  12. roughbarked

    roughbarked Registered User

    Dec 2, 2016
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    I'm happy to send you all the old crowns I have replaced. They are ony junk here.
     
  13. Grant Perry

    Grant Perry Registered User

    Jun 5, 2002
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    Hi guys,
    Thanks for all the help. I have ordered a new stem and crystal, but have yet to locate a crown. Roughbarked, I may take you up on your offer if I can’t find one. Thank you for the offer. It may not have rusted through, but there is rust where it broke. Wear and tear I guess.
    Grant

    570A1A6C-A8AB-4B7D-81B8-87F70E8AC344.jpeg
     
  14. roughbarked

    roughbarked Registered User

    Dec 2, 2016
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    Seiko Australia, in their great wisdom tossed their spare parts away. I've tried for several crowns from several parts suppliers recently with no joy.
     
  15. Grant Perry

    Grant Perry Registered User

    Jun 5, 2002
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    Hi Kev,
    Yes, it was one I got from Dan. Thought I would refurbish it. I had two before, but I think I sold them both to Mel.
    Grant
     
  16. Al J

    Al J Registered User

    Jul 21, 2009
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    You can mix up ma solution of alum and water (saturated solution, so as much as the water can take), put the crown in it making sure that the solution is in contact with the broken end of the stem. Every few hours, clean out the black material that will form as the stem dissolves, and put it back in the solution. Since the surface area is small, the alum will take some time to dissolve the stem, but if you keep making sure that the alum is in contact, it should be completely gone in a couple of days.

    Here's an example...

    Gucci1_zpsrzv5usrh.jpg

    Alum can be found in the spice aisle at the grocery store:

    Gucci2_zpsfyoysydr.jpg

    You can see the black debris in the hole here:

    Gucci3_zpsj6qqgejy.jpg

    Alum is something I use often, for removing broken stems in crowns, in particular valuable vintage crowns that can be worth hundreds of dollars. But it also works well for removing broken screws in plates and bridges, and in this case dissolving away parts from a bridge that had rusted in place after the movement was flooded. You can see it working...



    Cheers, Al
     
  17. Grant Perry

    Grant Perry Registered User

    Jun 5, 2002
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    Thank you Al,
    I have successfully used Alum in the past to remove dial hold down screws, and a jewel setting screw, but I wasn't sure what material the crown was made of and thought it may dissolve.
    Thank you for the confirmation. I think I learned that method on this board about 10 years ago. Maybe from you!
     
  18. Chris Radek

    Chris Radek Registered User
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    I've also used this technique to get hopelessly stuck screws (and hinge pins, for better or worse) out of vintage gold eyeglasses frames. Heating helps a lot.
     
  19. Grant Perry

    Grant Perry Registered User

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    Well, I can only assume that the old stem is made of something that is not affected by Alum. After 3 weeks the only thing that has happened is that the remainder of the stem is clean and shiny. I have used Alum before on pocket watch screws with no issues, but it has no impact on this one.
     
  20. Kevin W.

    Kevin W. Registered User
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    I work at the Veritas Tools machine shop.
    Nepean, Ontario, Canada
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    I have a Seiko Belmatic i bought from Mel, its a really nice watch. Hope you get the stem problem taken cared of.
     
  21. roughbarked

    roughbarked Registered User

    Dec 2, 2016
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    I am fond of the bellmatic but they can be a bit complicated to reassemble.
     

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