but my all time favorite would be with the ceramic case of the Amvox 3 which is absolutely to die for ( but very demanding to produce, I have heard).
Also, one note on the safety side of racing which could have added even more value to the watch, would have been a special strap made of materials that are FIA approved. This would allow a racing driver to wear the watch during an official race if he wishes, without breaking the safety standards of FIA.
Nice boutique edition.