So thin that its engineers and designers had to ditch the crown.

This is the company's 8th record breaker in 8 years. 8 sides. 8 patent applications. I'm surprised they didn't limit it to a run of 8 pieces. It's certainly understandable why Bulgari has limited this to a run of just 10, though. While I'm sure it's a delight on the wrist, I can see a piece this delicate returning for service often if worn with any degree of regularity. Particularly in light of the omission of various safety mechanisms typically found around the escapement and oscillator. That said, the engineering exhibited in this chef-d'œuvre is nevertheless impressive and the hybrid tungsten carbide mainplate that doubles as the caseback may prove any supposition of fragility unfounded—provided it doesn't fracture.

Beyond being the current record holder as the world's thinnest mechanical watch, it is entirely feasible the Octo Finissimo Ultra might very well house the thinnest free-sprung balance wheel ever produced.