Repairing a date-driving wheel

Certina 25-651 and 25-652: spring for date-driving wheel 2556

On these calibres, the date-driving finger regularly breaks. If a replacement part is unavailable or too expensive, the spring can be made from a bronze balance spring taken from an old alarm clock.

Once the small steel ring has been replaced, the spring can be changed. Here is a short series of photographs.

This part can therefore still be saved even when the last replacement part from the furthest box has been used up…