I have just bought a Citizen Eco-Drive 180 watch EW1170-51A. To complete the guarantee I need to fill in serial/model numbers and need to know how I can tell which numbers relate to what on the reverse of the case.
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There is not enough information given. Citizen is make. Eco Drive is patented micro electric system name. C650 is caliber number. C650 is fitted in to many Citizen watch models. Give us exact model name, numbers, serial, etc. - then we can give the size. For a while you can check out C650 here:
http://www.citizenwatch.com/COA/English/settingsresults.asp?caliber=c650Citizen watches here; www.citizenwatch.com
The ECO series of Citizen's do not require battery replacement, as they are solar powered. If the watch stops due to a long period of non-use, there is a procedure in the manual as well as the Citizen website on how to get it running again. You will have to expose it to light for several hours (but not with lots of heat such as a car dash) to get it running. If you continue to have trouble, you may have a problem with the watch. I bought my wife a ladies ECO drive about 8 years ago and bought one for myself about 2 years ago and have not had a bit of problems with either. They are extremely good watches and it is nice not to have to worry about "when will the battery die?"
Could be that the watch inside and outside numbers do not match. If the dial says Eco Drive, that should be the first step.
Next, find out about the 4 digit number that tells you which type we are looking at. You may want to open the back and look at the number on the watch internals. But be aware you may damage the water proof seal in doing so.
Really, you should write down all numbers you can see and send an email to citizen. They will help you.
If you need to know more about the Eco Drive, look for detail tech manuals for all types here: http://www.citizenwatch.com/downloads/tech/tech.htm
Those are great watches as long as you remember it needs light to charge.