Citizen 67-9577/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels
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Thread: Citizen 67-9577/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

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  1. #1
    Member 31 Jewels's Avatar
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    Citizen 67-9577/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    Name:  015.JPG
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Size:  171.7 KB This was something I knew was going to happen at some point. The 8100a. I have typed 8110a so many times that I have to correct myself. 8100a. This is Citizens single register chronograph from the mid 70's. Back in January i restored a Citizen 67-9151 8110a double register here on the forums that needed a metal movement holder. So I purchased these three watches just for their movement holders. On the left, a virtually complete Challenge Timer(for you Stephen) with its original dial and these (2) 67-9577 single registers. Both were complete with really nice dials and original hands. None ran or reset, and one had the wrong case back. I have asked Stephen if he would share his pictures of these models as references to show you what they look like in their original state in mint condition. All have really cool black date wheels and they are seldom seen for sale. Especially single registers. I wanted to see what I could do to restore these back to something awesome again. There were some challenges, and some twists along the way, and you might find this thread interesting as to where it goes in the end. Stay tuned, 31 Name:  014.JPG
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    Last edited by Athram; September 7th, 2013 at 18:20. Reason: Request from 31 Jewels.

  2. #2
    Member Morris Minor's Avatar
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    Re: Citizen 67-9557/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    I'm looking forward to seeing more of this thread!

    Although many people know at least some of the 8110a models, particularly the Challenge Timer (aka 'Bullhead'), the single register 8100a models are not seen very often at all. They were produced for only a short period, as far as I can determine only for a few years after their first appearance in 1972. There are no chronographs in Citizen's 1971 catalog, but they do appear (both types) in the 1973 catalog. By 1977 no 8100's are listed in the case parts catalog, whilst 8110's are still listed.

    Here are two examples of the 67-9577 which 31j is working on - first the black dial:

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    And second is the rarer blue dial with orange hands:

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    For more info on all Citizen's chronographs, and the rest!, please feel free to visit my blog

    Stephen
    Sweephand's Vintage Citizen Watch Blog | Citizen's watches from 1931 to 1980
    Last edited by Morris Minor; September 4th, 2013 at 22:48.

  3. #3
    Member Morris Minor's Avatar
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    Re: Citizen 67-9557/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    Repeat post deleted
    Last edited by Morris Minor; September 3rd, 2013 at 23:38.

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  5. #4
    Member Morris Minor's Avatar
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    Re: Citizen 67-9557/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    Repeat post deleted
    Last edited by Morris Minor; September 3rd, 2013 at 23:37.

  6. #5
    Member Igorek's Avatar
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    Re: Citizen 67-9557/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    Quote Originally Posted by Morris Minor View Post
    And second is the rarer blue dial with orange hands:

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    Now that one looks fantastic!

  7. #6
    Member Morris Minor's Avatar
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    Re: Citizen 67-9557/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    It's a nice watch Here's a little video of it in action:

    MVI_0489_zps0d7975e5.mp4 Video by Sweephand | Photobucket


    Stephen

  8. #7
    Member 31 Jewels's Avatar
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    Re: Citizen 67-9557/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    Name:  014.JPG
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Size:  103.3 KBI realized that I had made a mistake in the title of my thread. This model Citizen is not a 67-9557, its a 67-9577. I emailed a moderator to see if a thread title could be edited. So far no reply, so I'll just keep on rolling. Anyway, as you can see, both 67-9577 cases are in trouble. The spring bar holes are wiped out on both. These cases are I believe to be made out of aluminum or some kind of pot metal. The cases are to far gone for me to entertain. Since one is missing the original caseback, I had to re think what to do about bringing them back into usable restored watches. I spent months looking for spare cases. Nothing is around or available for a 67-9577, so its time for plan "B". Note that this one was made January 1973. See you in a day or two, 31 Name:  033.JPG
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    Last edited by 31 Jewels; September 6th, 2013 at 02:33.
    Eielson, jaliya48, DJW GB and 1 others like this.

  9. #8
    Member jaliya48's Avatar
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    Re: Citizen 67-9557/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    Lovely thread, 31! My observations have led me to believe that the 9577 case and the more common 8110a powered 67-9038 case are identical. The 67-9119 case, although similar, is different to the 9038 case. Differences aside, if you're on the hunt for a 9119 case, I've got a spare that you're welcome to utilise!

  10. #9
    Member jaliya48's Avatar
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    Re: Citizen 67-9557/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    Quote Originally Posted by Morris Minor View Post

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    Lovely watch and excellent strap!

  11. #10
    Member plainsimple's Avatar
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    Re: Citizen 67-9557/67-9631 8100a Custom Chronograph(s) Restoration and Service by 31 Jewels

    Yes! I love these threads.

    For the lug problem, I have seen another person using laser welding to fix broken lugs. Apparently not cheap, but seems to work nicely. This amazing project can be seen at:
    http://www.thewatchsite.com/21-japan...le-beware.html

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