09. GMT movement announcement
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  1. #1
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    09. GMT movement announcement

    We mentioned the use of the Sea-Gull ST16 movement for our 2014 GMT project watch, but we are afraid it is no longer available. Thomas has received news of the phasing out of 30+ movements with complications from mainstream Chinese manufacturers, including the ST16 GMT variation.

    After much discussion with Thomas and his contacts we have decided to use the Dixmont-Guangzhou DG3804B (with independent, adjustable GMT hand) as an alternative. His contacts say this movement is reliable, accurate and stable.

    The initial pricing of USD200-250 should not be affected by this change, even though the DG3804B costs slightly more than the ST16 variant.

  2. #2
    Member cygnus atratus's Avatar
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    Re: 09. GMT movement announcement

    Great stuff.
    Now on with more design decisions!!
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  3. #3
    Member FrakkenPrawn's Avatar
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    Re: 09. GMT movement announcement

    Sounds good to me
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  5. #4
    Member MEzz's Avatar
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    Re: 09. GMT movement announcement

    Sweet! now lets make the F72 Monaco GMT
    Dutchman72 and fliegerchrono like this.

  6. #5
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    Re: 09. GMT movement announcement

    okay by me!

  7. #6
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    Re: 09. GMT movement announcement

    I've been searching for opinions on this movement:

    From here

    The DG3804B is a very good and reliable GMT movement that is not converted or modified, but designed to be a GMT movement from it's start. RolexAddict uses that movement in his custom 1675 builds. I have used both the DG and the ETA movements in my 6542 builds. Once completed, there is no discernible difference. You can further modify the ETA 2846 to make it work as the old gen movement did, no date quickset, no hacking, no adjustable GMT hand. But to me that makes the watch just a pain in the 6, and those non-functions are not going to fool anyone. The beauty of the DG3804B is that at around 5 years when both movements would need servicing, the ETA will cost somewhere around $200. To service the DG3804B place the movement on the bench, hit it with a hammer, and replace the movement with a brand new one for about $25.
    SRBakker, nisse, MEzz and 1 others like this.

  8. #7
    Member nisse's Avatar
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    Re: 09. GMT movement announcement

    To service the DG3804B place the movement on the bench, hit it with a hammer, and replace the movement with a brand new one for about $25.
    sounds good to me
    FrakkenPrawn likes this.

  9. #8
    Member jon_huskisson's Avatar
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    Re: 09. GMT movement announcement

    Glad to hear that it has been decided, and from the comments above it sounds like it will be a solid movement.

    Am I correct to assume that the DG3804B will mean that the GMT function will be central (as opposed to being a subdial)?

    Looking forward to cracking on with the design. What's the next feature to be voted on?

  10. #9
    Member jon_huskisson's Avatar
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    Re: 09. GMT movement announcement

    A quote taken from WUS member fleigher on an old thread on this forum:

    "I have had this movement in two watches, it is bomb tough and very accurate if properly regulated I had one watch that kept +5sec/week, then my kid decided it would be fun to swing the pool bag about a dozen times against the sidewalk to hear the funny clunk, it was my watch. The sapphire crystal popped out, the bezel shattered, the lume pips fell off of the dial but the movement still ran fine. It had previously fallen from a 2 meter shelf to marble floor hitting so hard that the regulation bar turned to point the direction of the fall, re-regulated it ran just fine.
    The replacement watch with another dg3804 also runs great, again being a hacking mod Miyoua clone without an ETA adjusting screw just the bar it required a few weeks and a steady hand nudging back and forth to regulate down to about +8-10 sec/week as I didnt feel like digging out my watch microphone and preamp. The newer DG3804 has a much tighter GMT gearing, I dont need to set it on the GMT hour at 7-12 min before the minute hand reaches the top of the hour to account for gear slack as I did with the first watch."
    FrakkenPrawn likes this.

  11. #10
    Member nisse's Avatar
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    Re: 09. GMT movement announcement

    Name:  b-dg3804b.jpg
Views: 1447
Size:  46.2 KB I think this is it
    FrakkenPrawn likes this.

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