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I'm currently working on a Citizen 4520 movement. This has to be the smallest and weirdest quartz movement I've ever worked on.

Firstly, it's small. Really small. Here's a picture of it next to a LR44 battery for comparison. 

20250427_225758.thumb.jpg.fd7ffb9764bd08f84a9092ee0ccc653d.jpg

And unlike conventional quartz movements, the construction of this movement is really weird.

The moment I took off the top plate, the rotor and 1st wheel are exposed. The PCB is right on the bottom plate. There are no dial side components and cover plates. Everything goes in from the rear.

Not sure if I'm able to fix this watch. The old battery leaked and there are battery juice crystals everywhere. And there is a 1 uA constant leakage current, which will drain the tiny battery in no time. But at least there's still a pulse and the rotor twitches.

20250427_232008.thumb.jpg.34a6d3f03e570e1ed62c5c0dcccb356b.jpg

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