To get a flying tourbillon into the Jumbo case, AP needed to develop a brand new tourbillon motion. The Royal Oak Flying Tourbillons launched earlier this yr use the AP caliber 2950, which is 31.5mm x 6.24mm, and it has a bigger case than RD#3, at 41mm x 10.6mm. The RD#3, however, makes use of the caliber 2968 – a smaller motion, at 29.6mm x 3.4mm, which is significantly flatter than the 2950. For comparability, Bulgari’s caliber BVL 288, used within the Octo Finissimo Tourbillon Automated, is 1.95mm thick, however it’s additionally bigger in diameter than AP’s caliber 2968, at 36.60mm which is stepping into smaller pocket watch caliber territory. It is type of like squishing a jelly donut – you’ll be able to flatten it however it should unfold out on the identical time. Which means Bulgari’s Octo Finissimo Tourbillon Automated must be slightly bigger in diameter, at 41mm.