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Seeking info on CYMA chronograph
ztd125 posted a topic in Chat About Watches & The Industry HereGreetings, I am looking forward to being part of the WRT forum community and diving in with one of my favorite pieces I've found so far: About two weeks ago I picked up what I believe to be a 1940s era Valjoux 22 chronograph branded by CYMA as a Ref. 400L movement. I am struggling to find any info on the particular movement and was hoping that someone here might know a little bit about the Ref. 400L. Or, what the differences are between the 400L and the 22. Quick searches on eBay and Google leave me wondering what I really do have here. The only thing I have done with it so far was change the hands and add the chrono second hand (which was missing when I bought it) with something more era-correct and not as in-your-face as the bold hands that were on there when I initially received it. Unfortunately, Its not 100%... Now, I'm no watch maker by any means, but the movement looks quite dirty to my eye, and maybe even a bit pitted/rusty. And the balance assembly seems weak; visually ticks slower than I would have expected. The balance spring is not perfectly all in the same plane, it slouches downward a bit. And the chrono second hand resets beyond the zero position. Yet, the watch keeps decent time, haven't regulated it, but if I had to guess its somewhere around +10-15 s/d. So, at this point, I'm just looking for info on the movement. Does anyone have experience working on such movements? And then further down the line, I hope to either find someone to service it, or if I find enough info and feel confident enough, I may attempt seeing what I can do with the reset function personally. What are your thoughts? Any info is welcome. ~Cheers, Zach
Cyma Navystar Automatic
clockwatcher posted a topic in Chat About Watches & The Industry HereHi all! I picked this gold-plated Cyma up today after spotting it in a militaria dealer's shop. I think the only military connection is the 'Navy' in the name but the watch seems pretty nice. The dial and hands are unmarked and the crystal only lightly scratched. The numerals at 6, 9 and 12 are Roman and the batons are long (even numbers) and short (odd numbers). There are one or two small dings in the case but the plating is fine. Cosmetically the worst thing is the back. Someone has tried hard to get the back off in the past and in failing has left a number of deepish scratches. It was damned hard to get off but having the right tools made the difference. The other slight letdown is the crown, from which the gold is peeling. The movement is a CYMA R.824.00 but I can find nothing about it online. Ranfft doesn't list the movement (at least, not under Cyma) so I hope that some of you can shed some light. The name and movement number are on the rotor along with '21 jewels Swiss'. To the left of the balance on the edge of the bridge is the number 816. Inside the back it's stamped 7-824-001-8 and 525 and the case is stamped between the lugs - 78240018 and Plaque Or G20 (with a symbol for microns that I can't type). The mainspring will take power from the winding stem and the only problem I can find is that the click occasionally slips, whether from a loose screw or wear on the click or ratchet wheel I can't yet say. I gave it a few turns and the watch has been going well, and accurately as far as I can tell. I'm very pleased with the watch as it was bought very reasonably but I'd like to know more about it if anyone can add anything. Sorry about the pics, they were taken with my phone.
Cyma R-425 Service "Things that go bump in the night" Here's something a little different, that I hope you all find enjoyable to follow. A Bump Automatic by Cyma ... the R-425 Movement. This watch was purchased by my Uncle in Sierra Leone back in the 60's, in his wilder younger years. The automatic winding feature of this movement using a "Bump" system, which these days is a very rare method of winding the mainspring As you may have noticed in the first picture of the Dial, the numbers on the Date Wheel have been removed. Once I pulled off the Dial I could see that the number have peeled off the Date Wheel and adhered to the back of the Dial. I have no idea how this happened :wacko: One possible explanation is that the previous person who serviced this watch cleaned the Date Wheel with something that over time loosened the paint and glued it to the back of the Dial ... who knows :blink: As you can see, whatever they used completely stripped the painted ... absolutely nothing remained on the Date Wheel. Anyhooooo, on with the disassembly ... The plate that secures the Date Wheel on this movement is a full plate, held by 2 screws. Once removed we can see the Keyless Work and the Calendar Work. All very standard looking with no surprises. Here's a closer reference photo of the Keyless work. Once the Calendar and Keyless Work was removed I flipped the movement over and removed the Bump Weight. The Automatic Gear Train Bridge was the next to be removed. Once the bridge was removed the Automatic Work is revealed. Notice the fine spring system for the Ratchet Arm of the Automatic Work ... this same spring system is used throughout I removed the plate that holds the Auto Work revealing the next layer containing the Barrel Bridge and Gear Train Bridge. The Gear Train is your typical looking train except for the having the Second Wheel come up through the plate and running to a long fine pinion. Very interesting and you rarely see this type of complexity in your average movement these days. The shock system for the Balance is one I'm not familiar with and would appreciate some input from the old hands on how to clean and oil this correctly. And yes, the Balance is 18ct Gold ... very purrety B) Here are all the parts after cleaning ... LOTS of plates in this movement, they fill half the parts tray :P Stay tuned for the assembly!! And I may have a solution for the Date Wheel ... :ph34r: