Which one is the working Due version?

Hardware Arduino Due
67

Markus_L811:

Thanks, that's useful to know. Could you have a close look under a magnifying glass and tell me if the capacitors next to the crystal are also missing? I'd probably be able to solder the crystal back on if I needed it, but the capacitors would be impossible.

I can,

From Arduino Store now Crystal no capacitors.

From eBay Crystal and capacitors.

Thanks again.

I tried soldering on a watch crystal by itself and it is not enough - in fact it is worse, only 42 seconds per minute! With capacitors it runs at a more conventional 60 seconds per minute :slight_smile: But there is no easy place to solder the capacitors on (I was literally holding them between the crystal and the shielding of the USB port, which can't have helped the accuracy much).