Time-Tee’s
Citizen Cosmotron Electronic Balance Watch 1974
Citizen Cosmotron Electronic Balance Watch 1974
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This is a lovely example of a Citizen Cosmotron lovingly restored my me to bring it back to life and to show off that absolutely stunning dial!
The Cosmotron were out at the same time as the very first quartz watches, the movement in this one is a 7804. It is a machanical movement with a balance wheel but instead of a mainspring and barrel it has a battery. The battery goes though a circuit with a transistor to a coil. The coil is sandwiched between two wheels on the balance wheel, one wheel has magnets on them (yes magnets in a mechanical watch!) the coil pulses with the current and the magnets are opposite poles which makes the balance swing. The movement of the balance then transfers its power down the train of wheels, eventually to the hands, in effect moving the opposite way to any conventional mechanical watch which goes from mainspring to balance wheel. This regulated pulse makes the watch run efficiently and more accurately. Also gives a sweep second. The joy of these is you can take them off for weeks at a time and they will just keep going, ever ready to wear!
I have fully stripped down the movement, inspected every component, cleaned and serviced and it is now running very well (see the timegrapher video)
The watch has has a new old stock original Citizen crystal installed. These are getting very hard to find now but I felt for a dial like this that it needs to be seen!
Case and bracelet have been cleaned and sterilised. A light polish to the case and some re-brushing to the bracelet and end links. This watch has had the works! New gaskets to keep it as safe as possible. Please do not bathe or swim with this watch as it would void any warranty.
Dimensions.
Case Diameter 38mm
Thickness 12.20mm
Lug Width 18mm
Lug to Lug 41.5mm
Please look at all photos and videos in this listing to aid with any purchase decision. US buyers, Tariff should show in checkout. Being Japanese it would be 15%
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from 39 reviewsA great looking watch and all working perfectly
Thanks again Mike.
A great looking watch, another fine example.
Many thanks toSeik Mike.
Wonderful piece that wears perfectly.
What an addition to my beginners collections.
Thanks Mike for the watch. Truly cool that you worked this piece and performed a thorough cleaning and maintenance.
Kevin/Michigan
The first thing I did was change the band. Much too big, but I have small wrists. I then set the watch by WWV, then waited. And waited. And waited! It was nearly two weeks before the time error was big enough to bother me! Never had a watch this accurate before. The watch looks and feels good on the wristsnd it’s nice to know it’s “made in America”
Another great watch fromTime-Tees all working perfectly and looks great.
Many thanks.
Even more beautiful in person, thanks Mike
This is number4 watch that I have purchased from Time tees and they are all brilliant , well serviced and exactly described in the video descriptions .
Am really pleased with my purchase, the watch is lovely and is nicer than I was expecting it to be.
I’ll certainly be buying again in the future
This is my first Technos and I must say I am impressed, There is so much light play going on in a refined way, the dial has "Geneva stripes", the Sapphire glass is facetted, so I just sit in the sun, admiring what happens, when I move my hand. I often ask myself afterwards, "What was the time?" and I have to look again. Due to the case is Tungsten/Wolfram, there is not a scratch on it, it looks like new, arriving with a time machine from the 70ts.
The price was a bargain, and as it was stated in the description, it is due to the small beautiful bracelet, that only my wife can wear, but she won't. ;-)
So I have put it on a leather strap, and it looks perfect, for office and party.
I am a very happy customer
The watch is absolutely gorgeous and gently humming away and another stunning tribute to Mikes skill. It's on the green rally strap which complements it perfectly. However, my wife has taken a shine to it and now wears it when it goes with her blouse, handbags, shoes etc.
Oh well its a good excuse buy another watch!
I love the 70's and I love this watch, case shape and dressy white dial. Delivered with a nice Croc. embossed leather strap and protective film on the spotless dial glass. I am very happy that this is now my watch, it's clearly a keeper.
I love my new Seiko, judging from your Web pictures and the description I knew something special was to be sent to me and oh my what a dial!, it looks like nothing I have seen before, like brown or golden colors on a bark structure, it plays with the light give all these colors.
Bracelet is beautiful smooth with its small links. The whole watch is simply a winner and I am so happy to be the owner :-)
Tshirt is top quality. Will return for another soon.
Wonder watch
Great review
Order and shipping was perfect