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  1. timjohn Feb 20, 2023

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    I'm guessing here, but possibly it calculates average speed over a known distance -- eg 100km is four laps of the full Nurburgring -- using the start/stop buttons.

    Here's my 8T23 -- the first and as far as I am aware only manually wound quartz watch. James Dowling and @tyrantlizardrex are to blame for the show and tell at time4apint that got me into it, and the superb Kay @krogerfoot for helping get it from Japan (it is also his pic). I'm now trying to find a replacement capacitor....

    Seiko 8t23.jpg
     
  2. Dsloan Feb 20, 2023

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    That's an interesting theory on the giugiaro. I'll have to keep poking around until I can figure it out.

    Thanks for sharing the manual wind quartz! I was able to find a nice write-up on it: https://www.plus9time.com/blog/2017/12/28/worlds-first-hand-wound-quartz-seiko-8t23.

    It's funny to me - we're so used to ultra cheap quartz movements, it's surprising to think about how complex and exciting the development of these technologies were at the time - like having to figure out how to get consistent movement from the stepper motor despite changes in voltage depending on the amount of charge in the capacitor.
     
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  3. Walrus Feb 21, 2023

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    Ya I know what you were going for the strange seiko but I’m a rebel without a clue and that Credor was being sold on Reddit for 40k or so I think
     
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  4. mountainunder Feb 21, 2023

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    The reissued watches (SBJG001,SBJG003 A825-00A0,A825-00B0) released in 2018 have the same features, so why not consult the manual!
    You can download the PDF here
    https://www.seikowatches.com/jp-ja/-/media/Files/Common/Seiko/instructions/English/A/A825/A825.pdf
     
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  5. Dsloan Feb 21, 2023

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    Edited Feb 21, 2023
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  6. Dsloan Feb 21, 2023

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    Sorry, I didn't mean to gate-keep this thread. Credor movements are very pretty indeed.

    Seiko-Credor-Fugaku-Tourbillon-aBlogtoWatch-5.jpg
     
    Edited Feb 21, 2023
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  7. Dsloan Jul 1, 2023

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    Reviving an old threat for a super strange, formerly top-shelf quartz movement that I saw in the wild today.

    PXL_20230701_193317913.jpg

    The LED at top right blinks every second just to remind you of it's high tech engineering.
     
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