Received as an inheritance from when my father passed away; it was a gift from my mother to him when I was very young. I remember him wearing it every day for the rest of his life.

At one point I remember him working on our 1959 Simplicity Wonderboy garden tractor without disconnecting the battery. The watch band shorted the battery and heated up, welding to his wrist. He had to use a long flathead screwdriver to break it off of himself. While the band was destroyed, the movement still worked.

I’m currently working on cleaning it up and restoring function to it as it has since stopped allowing the time to be set. This article is to act as a compendium of information I’ve gathered in my research of the watch.

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Citizen 3510 Technical Details

Manufacturer	Citizen
Caliber Number	3510, 3510A (aka 3S10)
Type	Quartz
Lignes	13 1/2”’
Diameter	30.8mm
Height	4.10mm thick
Jewels	12
Battery Cell Number	SR927W (399)
Frequency	32,768Hz
Quartz Type	Tuning fork type quartz crystal
Stem	065-349 P.4/065-392 lg
Hand Sizes	1.2mm / .70mm / .20mm
Integrated Circuit	14-279/469 (C/MOS-LSI)
Hacking?	Yes
Functions	Central hours, central minutes, central chronograph seconds, 1/10 seconds subdial between 3:00-2:00, 60 minutes chronograph subdial at 6:00, 12 hours chrono subdial between 9:00-10:00, date at 6:00 or 4:00 (depending on dial design), alarm
Country of Manufacture	Japan

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Manuals

Technical Teardown Manual

Teardown can be found starting on page 12-13

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