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Discussion Starter · #1 ·
I've just picked up a 1975 Citizen Cosmotron - described as 'junk' it aroused my curiosity since it had 5800 movement markings yet was clearly a medium sized men's watch. The 5800 movement was used in the 'IC-12' ladies' watch, an electro-mechaical wonder that ran at 12 beats per second (43,200bph). The seller described the watch as non-working, even with a new battery fitted, but I thought it would be worth getting at the 1000JPY asking price (just under 12USD) just to check out whether it did indeed have a 5800 movement (I can find no reference to this being fitted to a men's watch).

Here's the seller's picture, showing a very dirty and/or corroded piece:

On the positive side, the dial hands looked good, and I liked the 'deco' style numerals. A possible project watch then if I could get a working movement.

The watch arrived this morning, clearly not running - first thing to do was get rid of the nasty (i.e. very dirty) expanding bracelet and clean up the case. I was pleasantly surprised to find that the case was also dirty rather than corroded, so next I cleaned it up. Dial and hands are nice, glass has some scratching but not really noticeable on the wrist:

The dial was marked correctly for a 5800 movement, and this was confirmed on the back which was also in decent condition:

So, to the movement.....and yes it's a 5800, looking a little lost in the men's case, but very clean, no corrosion and a healthy looking hairspring. I thought I may as well try a new battery, and guess what? It fired up immediately and has now been running smoothly for the past 4 or 5 hours ;)

The movement has 17 jewels and a fine adjuster as you'd expect in a high beat caliber:

Needless to say I'm very happy to have a working watch of this quality for about 12USD. I guess this is also quite rare since I've not seen another like it as yet....


2,569 Posts
Another interesting catch Stephen 8)

I love these electromechanical movements.
Too bad quartz displaced them or I'm willing to bet the technoogy would have advance enough to maybe rival what the Spring Drive can do at it's worst end of the specs :)
With today's materials and manufacturing capabilities, there might even have been much higher beat movements of this type...alas, we'll never know :(

Your new watch cleaned up really nicely.
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