30.8mm Quartz Chronograph Movement with Single Calendar: When a Watch Stops, Runs Wrong or the Chrono Hand Will Not Reset - and How to Check the Fit
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About this product
A quartz watch that stops, runs slow, or has a chronograph hand that no longer resets to twelve is usually telling you one of three things, and working out which one decides whether you need a whole movement or just a battery. If the seconds hand jumps once a second, the battery is flat - a new cell cures it. If the watch runs but is badly fast or slow, or the chronograph pushers do nothing, the movement's oscillator or the reset mechanism is the suspect, and that is where a replacement movement like this 30.8mm quartz chronograph comes in. If the hands and date are fine but there is corrosion or a dark patch on the dial near the crown, water has probably got in, and the movement is the least of the problems. To confirm a swap is the right fix, compare your old movement against this one: measure the diameter (30.8mm is a standard chronograph size), note the thickness, and check where the date window sits - a single calendar at 4:30 or at 3 o'clock, because the dial hole has to line up. Hand-fitting diameters and the winding stem height decide whether your existing hands and case will work. Movements of this class run at 32,768 Hz and usually take a 394 / SR936SW-type button cell, but confirm the cell type on your old movement rather than assuming. Fitting one needs hand-lifting tools, a stem to cut, and a dust-free bench, so if you have never done a swap, a watchmaker's labour charge is often cheaper than a scratched dial.
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Pros & cons
Pros
- 30.8mm quartz chronograph movement - a standard size watchmakers use to revive cases whose original movement is dead
- Single calendar layout suits dials with the date at 3 o'clock or at 4:30, matching the common chronograph dial
- Quartz keeps time without winding and only needs a battery, so the fix lasts once done properly
- Low cost makes it practical to bring an old watch back to life or to build from a spare case
Cons
- Before swapping, measure diameter, thickness, date-window position and hand-bore diameters - if the size or the date position differs, it will not fit the original case
- The listing does not state the button cell type or the timekeeping accuracy; quartz chronographs of this class usually take a 394 / SR936SW cell, so confirm on your old movement
- Pusher positions and the reset arrangement vary between movement types - if the pushers miss the case holes, you may have to change the whole case too
- Fitting needs hand-lifting tools, a stem to cut and a dust-free bench; a first attempt can easily scratch the dial
