Out-of-the-box design allows Bulgari to squeeze a tourbillon into its thinnest dimensions ever.

“When we sent the design for the Finissimo to our case maker, they called to tell us that we had forgotten to send them the file for the case back,” recalls Guido Terreni, managing director of Bulgari’s watch division. The unusual integrated case back construction was just one strategy that Bulgari’s watch designers utilized to produce 2014’s Octo Finissimo watches, the brand’s entry into ultra-thin timepieces. O…