Arnold made another watch for the King around 1768, which was a gold and enamel pair cased watch with a movement that had every refinement, including minute repetition and centre seconds motion. In addition, Arnold fitted bi-metallic temperature compensation, and not only was every pivot hole jewelled but the escapement also had a stone cylinder made of ruby or sapphire. Arnold designated this watch "Number 1", as he did with all watches he made that he regarded as significant, these numbering twenty in all.