VERY RARE NOS ETA 536.121 circuit board (part 4000)

The CWC 'Fatboy G10s from 1980-82 (and the Precista 'Fatboy' from 1982) were fitted with the ESA/ETA 536.121 quartz movement. Over the years many of these have suffered from battery leakage or water ingress leading to failure of the circuit board, or sometimes after decades of service, the chip on the circuit board just fails and it stops working. Most of the other components can be rescued or replaced, but a dead circuit board usually is usually the end of the line for the watch.

Working 536.121 circuit boards are therefore very sought-after items and are extremely hard to source.

We have a very small supply of these precious parts which are new old stock and tested. They are supplied 'loose pack' and are not in the original blister packs or the labelled box shown in the images, but will be safely packaged.

The movement in the images is shown for illustration purposes only and is not included. The circuit board shown fitted to the movement is illustrative only. The main images show the actual NOS part.