How old is this seiko watch?

Thread: How old is this seiko watch?

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  1. #1

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    How old is this seiko watch?

    Hello. i bought this watch this week.
    Please share your knowledge and comment about this watch. How old is this watch?
    What is the "LC-liquid crystal" ? is this different than standart digital watches?
    made time: 1970? 1975? 1980?

    Seiko
    LC - Liquid crystal
    Only light and date.
    No chronograph.
    CAL.0439-4019
    SER.712693



    Last edited by dincer; November 22nd, 2008 at 22:00.

  2. #2
    Member Ray MacDonald's Avatar
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    Re: How old is this seiko watch?

    I'd guess around 1980 but others might know more.

    There are fathers who do not love their children; there is no grandfather who does not adore his grandson. ~ Victor Hugo

  3. #3

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    Re: How old is this seiko watch?

    Quote Originally Posted by dincer View Post
    Hello
    How old is this watch?
    made time: 1970? 1975? 1980?

    Seiko
    Only light and date.
    No chronograph.
    CAL.0439-4019
    SER.712693

    Nice vintage LCD! I would say your watch was made in January of 1977. Seiko dating is fairly straight forward. The first digit of the serial number represents the year, the second digit the month of manufacture. The decade of manufacture is sometimes an issue, but looking at the style and features of your watch, it is very likely (almost certainly) a 1970s watch. I've attempted to attach a technical guide that should tell you more about your watch.

    Doug
    Attached Images Attached Images
    Last edited by dbadcraig; November 22nd, 2008 at 17:16.

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  5. #4
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    Re: How old is this seiko watch?

    Dincer!
    When your watch was designed, there were two new, different dial technologies.
    LED = Light Emitting Diode (press a button, red numbers light up)
    LCD = Liquid Crystal Display (LC = Liquid Crystal, is the same) Numbers visible all the time.

    Manufacturers I guess wanted to show (proudly) the tech they used.

    LED disappeared after some years, I do not why. Power sapping, difficult/expensive to make?
    Last edited by Janne; November 22nd, 2008 at 21:21.

  6. #5

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    Re: How old is this seiko watch?

    Thanks for all answers...

    Janne,
    is this a question to me? I can't understand what means that, sorry...
    "Power sapping, difficult/expensive to make?"

  7. #6
    Member Eeeb's Avatar
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    Re: How old is this seiko watch?

    Quote Originally Posted by Janne View Post
    ...
    LED disappeared after some years, I do not why. Power sapping, difficult/expensive to make?
    It requires a lot more power to generate photons than to reflect them...
    "Forever is composed of nows." - Emily Dickinson

    "The watch has to be surrounded by a history.
    You need more than just a great design. You need to create an atmosphere around the product.
    Who is the company behind it? Why are they using this material?
    People need to be able to identify the watch with themselves. It's based on emotion." - Ralph Furter

    ...that's just my opinion and I've been wrong before and will be again and might be now!

  8. #7
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    Re: How old is this seiko watch?

    Quote Originally Posted by dincer View Post
    Thanks for all answers...

    Janne,
    is this a question to me? I can't understand what means that, sorry...
    "Power sapping, difficult/expensive to make?"
    It was just a general question. I was (before Eeeb's answer) not sure if it was the manufacturing cost or the limited battery life that killed off the LED.
    Now I know!

  9. #8

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    Re: How old is this seiko watch?

    i can understand now, thanks..

  10. #9
    Member JohnF's Avatar
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    Re: How old is this seiko watch?

    Hi -

    While classic LEDs are power hungry, OLED - Organic Light Emitting Diodes - have usually identical power usage of same-size LCD displays, replacing these directly (at an admittedly higher cost). Power efficiency for commercially available displays is as high as 89%. Due to the relatively high voltage levels (between +2.7 and +5.5 to -7 volts for a modern TI active matrix OLED or AMOLED), you'd need to use a cell phone battery back to power the watch, but you'd have battery life equal to standby times of modern cell phones, i.e. ca 5-10 days). Plug in a USB charger once a week for an hour or so, and you're fine. For a unit ca 25mm on a side, maximum load is ca 200 mAH, but more typical load is 50 mAH, despite the fact that the active matrix peak and average loads are about the same (due to TFT control of the frame).

    Interesting concept: circular array of 900 dpi (300 dpi for each R,G,B) AMOLED, say 40mm in diameter, as watch display, reprogrammable to look like any watch you want it to be, full spectrum of colors...wouldn't be cheap, but you could even use it to display a looped gif of a tourbillion, even cycling it through random watch designs on a minute-by-minute basis... hmmmm. Switching times are on the order of MHz, too...

    Quantum dot OLEDs would be even more efficient...

    And no, this isn't something you can buy today. I think we're at least 5 years away from being able to order the parts, let alone build such a watch...

    JohnF

    PS: one absurdity that I ran across researching this was the idea that "organic" LED light was healthier for you...because it was organic. I fear for the future of the human race...
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  11. #10
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    Re: How old is this seiko watch?

    John!
    You mentioned the size of the battery would be about the same as in a mobile phone (US = cellphone).
    The size of watches is now approaching that size, so no need to shrink the battery!

    Lots of people, mainly in english speaking countries, do not use the word "organic" (carbon based) as it meant to be used.
    In most other languages a different expression is used for "the other" organic meaning.
    Oekologish in German etc
    Last edited by Janne; November 23rd, 2008 at 05:11.

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